JPH07239665A - Display device - Google Patents

Abstract

PURPOSE:To facilitate checking of display contents by marking characters indicating the corresponding contents on the front and rear of a display mounted at a rotary drum. CONSTITUTION:The display 3 is insertably mounted at the rotary drum 4 which is rotated by a gear transmission mechanism rotated by a driving motor. The driving motor is run forward and backward within a range of 180 deg. by a control circuit 5. The display body 3 consists of a transversely long plate body. The characters, such as 'Absent', 'Vacant' or 'In preparation', are displayed thereon while the display is not in operation. The characters, such as 'Present', 'Using' or 'Open' are stated on its corresponding rear surface. The driving motor tends to rotate to an angle >=180 deg. of the rotary drum 4 by inertia but a slip mechanism 30 consisting of a worm wheel 20 of a gear rotating mechanism and the rotary drum 4 is interposed therein and, therefore, the overrotation by the inertia of the driving motor is absorbed by a slip of a friction part piece 31 and the rotary drum 4 stops by correctly rotating 180 deg..

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present application relates to a display device for displaying an inoperative state of a front surface display of a display body and an operating state of a rear surface display rotated by 180 ° from the inactive display state.

[0002]

2. Description of the Related Art Conventionally, for example, "absent" and "present", "vacant" and "in use", or "preparing" and "open" are displayed separately. For this purpose, a window is provided on one side of the front plate of the horizontally long frame having front and rear face plates,
Characters such as "in-room", "in use", or "in operation" are written between the front and rear face plates, and the position of this character facing the window and the position hidden behind the front plate of the frame body. Is provided with a display plate slidably mounted in the lateral direction between them, and further, "absent", "vacant" or "preparing" on the front face of the rear face plate facing the window portion.
Characters such as "" are written, and by sliding operation of the display board, characters such as "in room", "in use" or "in business",
A display device having a configuration in which characters such as “absent”, “vacant room”, or “in preparation” are relatively displayed on the window is known.

[0003]

However, according to the conventional structure, the structure for sliding the display plate to correctly position it at the position facing the window and at the position hidden away from the window is bothersome. However, there is a risk that the display plate will be easily displaced from the above-mentioned positions, resulting in misidentification of the display, and there are less characters to display than the size of the frame, and the display effect will be impaired. Have.

[0004]

Therefore, in order to solve the above-mentioned disadvantages of the conventional one, the present application provides a drive motor,
A rotary drum that is rotated by the drive motor via a transmission mechanism, a display body that is attached to the rotary drum, and that displays characters that indicate the contents facing each other, and displays the contents that face each other. It is characterized in that it comprises a control circuit for controlling the rotating drum forward and backward at an angle of about 180 ° so that the displayed characters are positioned in the display direction. Preferably, the display body has an illumination mechanism. At the same time, the control circuit is provided with a circuit that energizes the illumination mechanism when the rotating drum rotates in the forward direction and releases the energized state when rotating in the reverse direction. In the above, the display body is detachably attached to the rotary drum so that the display body can be exchanged. Specifically, the rotary drum is composed of a vertically long member and extends in the longitudinal direction on the side surface thereof to allow insertion of the base portion of the display body. And an auxiliary member provided with an elastic holding piece for holding the base portion of the display body inside, and a case where the rotary drum is made of a vertically long member and extends in the longitudinal direction on its side surface. In addition to providing an insertion port that allows insertion of the base of the display body,
The elastic holding portion includes a holding cylinder having an elastic holding portion for holding the base portion of the display body therein and having a terminal portion piece including a terminal portion for electrically connecting the control circuit and the illumination mechanism of the display body disposed therein. May be provided so as to face the insertion port. The control circuit also has an operating cam that rotates with the rotating drum,
The rotation of the actuating cam causes a relative action of the actuating cam and a pair of detection switches which are always on and which are in an off state when actuated, and the actuating switch is turned on to relatively switch the polarity of the drive motor. A relay having a first contact and a second contact, wherein the detection switch is connected between both ends of the motor and a switching contact that relatively switches the first contact; , An operating cam that rotates together with the rotating drum, and a pair of detection switches and an operating switch that are always on and that act on the operating cam relative to the operating cam by rotation of the operating cam and are in an off state at the time of the operation.
A relay having a first contact and a second contact for switching the polarity of the drive motor by switching relative to each other, and a circuit for energizing the illumination mechanism by turning on the operation switch. In some cases, the detection switch is connected between the switching contact for switching to and the both ends of the motor.
Furthermore, a slip mechanism is provided between the drive motor and the rotating drum to absorb the rotating force when an unnecessary rotating force is applied to the rotating drum by an external force.

[0005]

However, when using, the operation switch is turned on.
When set to N, the relay operates to switch the pair of relay contacts, and the motor rotates in the forward direction due to the ON state of one detection switch, which causes the rotary drum to rotate 180 ° through the transmission mechanism. The display body rotates from the inoperative state of the front side display to the operating state of the back side display. Therefore, the characters such as "in-room", "in use" or "in business" displayed on the back side are displayed. This rotation causes one of the detection switches to act on the actuation cam to turn it off, so that the rotation of the motor is stopped. In this case, even if the motor excessively rotates beyond the display state due to inertia, the rotation is absorbed by the slip mechanism, and the display body is set at a predetermined position. Next, when the operation switch is turned off in order to return the display body from the operating state to the non-operating state, the pair of relay contacts are switched and the other detection switch is already turned on. As a result, the rotary drum also rotates 180 ° in the opposite direction and the display body returns from the operating state of the back side display to the inactive state of the front side display, and this rotation causes the other detection switch to act with the operating cam. Then, since it is turned off, the rotation of the motor is stopped. Therefore, in this state, the characters such as "absent", "vacant room", or "preparing" displayed on the surface are displayed. When the display body is equipped with an illumination mechanism, the operation switch O
When the display body is rotated from the inoperable state of the front side display to the activated state of the back side display by N, the lighting mechanism is energized, and the operating state of the display body is changed to the inactive state of the front side display by turning off the operation switch. When returning to the above position, the energized state of the illumination mechanism is released.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present application will be described in detail below with reference to the drawings. In the present application, a drive motor 1, a gear transmission mechanism 2 rotated by the drive motor 1, a rotation by the gear transmission mechanism 2, and a display member 3 are provided. The rotary drum 4 into which the motor can be inserted and the drive motor 1 in a range of approximately 180 °,
A control circuit 5 for reverse rotation is provided on a substrate 6, and the display body 3 is composed of a horizontally long plate body. For example, "absence" or "vacancy" is present on the surface displayed in the inactive state. Or “Preparing”, and the operation switch S described later.
Characters such as "in room", "in use", or "in business" are written on the back surface rotated by about 180 ° by W.

The board 6 is composed of a vertical piece 6a and a horizontal piece 6b which are bent in an L shape. The vertical piece 6a has a mounting hole 10 so that the vertical piece 6a can be mounted on a wall surface. 6b is a standing piece 11 provided by cutting and raising, a horizontal top piece 12 is provided at the upper end, and a horizontal receiving piece 13 is provided at the lower end. 13 'is mounted vertically, and the drive motor 1 is mounted on the receiving piece 13.

The gear transmission mechanism 2 is provided with a worm 16 provided on the output shaft projecting downward from the receiving piece 13, and a worm 16 provided at one end of a rotary shaft 17 supported horizontally with respect to the substrate 6. A worm wheel 18 that meshes, a worm 19 provided at the other end of the rotary shaft 17, and the worm 1 rotatably supported at the lower end of the rotary drum 4.
The worm wheel 20 is a terminal gear that meshes with the gear 9.

The rotary drum 4 is long in the vertical direction and its cross section is in the shape of a cut circle, and an arcuate top portion is provided with an insertion port 21 opening along the longitudinal direction. Inside the rotary drum 4, as shown in FIG. 6, a plurality of elastic holding pieces 23 made of a steel plate, which are bent in a U-shape and each of which has a bullet piece 22 inwardly folded back, are formed on the opposing pieces. Auxiliary members 25 having a U-shaped cross section, which are respectively arranged between the partition pieces 24 provided along the vertical direction, are provided so that the opening surfaces thereof face the insertion ports 21. The mounting portion 3'of the display body 3 is sandwiched by the bullet pieces 22 facing each other on the left and right.

An upper end of the rotary drum 4 is supported by a top piece 12 of a support plate 14, and a supporting shaft 26 is provided at a lower end of the supporting plate 14 so that a tip end of the supporting shaft 26 is a horizontal piece of the substrate 6. 6b, a slip mechanism 30 is interposed between the rotary drum 4 and the gear transmission mechanism 2. This slip mechanism 30, as shown in FIG.
The friction piece 31 interposed between the lower surface of the worm wheel 20 and the worm wheel 20 of the gear transmission mechanism 2, and the worm wheel 2
It is composed of an elastic pressure piece 32 that presses 0 to the friction piece 31.

As shown in FIG. 7, the control circuit 5 for controlling the forward and reverse rotations of the rotary drum 4 within a range of about 180 ° is connected to the power source E in a series circuit of an operation switch SW and a relay R. And a pair of relay contacts RA and RB which switch the polarity of the drive motor 1 by relatively switching the operation of the relay R at both ends, and the switching contacts a ′ and b ′ of one relay contact RA. Between the two ends of the drive motor 1, a pair of detection switches LS1 for detecting the rotation direction of the drive motor 1 by relatively turning on and off by an operation cam 33 axially attached to the support shaft 26 of the rotary drum 4. LS2 and LS2 are respectively connected in parallel, the operating cam 33 is formed in a protruding shape, and the pair of detection switches LS1 and LS2 are provided so that the operating cam 3 operates when the rotary drum 4 is rotated by about 180 °.
3 is disposed on the horizontal piece 6b of the mounting plate 6 so as to abut one side edge of each other by the detection switch LS1.
, LS2 are normally ON switches that are turned OFF when they come into contact with the actuating cam 33.

In use, however, the mounting portion 3'provided at the end of the display body 3 formed of a horizontally long plate as shown in FIG. 9 is previously inserted into the insertion port 21 of the rotary drum 4, and the mounting portion is attached. 3'is clamped by a pair of opposing pieces 22.
Then, in the front display state in which the display body 3 is parallel to the vertical piece 6a of the substrate 6, as shown in FIG. 7, one of the detection switches LS1 is turned off by the contact of the actuating cam 33. When the actuation switch SW is closed from the state shown, the relay R is actuated and one relay contact RA is switched from the switching contacts a, a 'to b, b', and the other relay contact RB is switched from the switching contacts c, c 'to d. , D ', respectively, so that the energizing circuit of the switching contacts b, b', the detection switch LS2, the drive motor 1, the switching contacts d, d'is formed, and the drive motor 1 rotates in the forward direction. Transmission mechanism 2
The rotary drum 4 is also rotated forward in the direction of the arrow through the display body 3 so that the display body 3 moves from one display state parallel to the vertical piece 6a of the substrate 6 to the other display state parallel to the vertical piece 6a, that is, the solid line in FIG. The front surface 3a of the display body 3 is rotated 180 ° from the inactive state in which the front surface is directed to the front, and the back surface 3b of the display plate 3 is moved to the active state in which the display direction is directed as shown by the phantom line in FIG. Move.

Therefore, in the inoperative state shown by the solid line in FIG. 3, for example, "absence", which is described on the surface 3a of the display plate 3,
The characters "vacant room" or "preparing" are displayed, and in the operating state shown by the phantom line in FIG. 3, for example, "in room", "in use" or "in-use" written on the back surface 3b of the display body 3 is displayed. The word “Open” is displayed. In the above, when the rotation of the drive motor 1 is started, the actuating cam 33 separates from the one detection switch LS1, so the detection switch LS1 is turned on, but the switching contacts a, a'and c, c'are both non-conductive. Since it is in the state, the forward rotation of the drive motor 1 is maintained.

The rotating drum 4 rotates 180 ° and the display member 3 is rotated.
In the operating state of the display body 3 parallel to the vertical piece 6a of the substrate 6, the operating cam 33 contacts the other detection switch LS2, so that the detection switch LS2 is turned off and the energizing circuit of the drive motor 1 is cut off. The rotation of the drive motor 1 is stopped and the state shown in FIG. 8 is obtained.

In the above, the drive motor 1 tries to rotate by more than 180 ° angle of the rotary drum 4 due to inertia,
Worm wheel 20 and rotary drum 4 of gear transmission mechanism 2
Since the slip mechanism 30 is interposed between and, the excessive rotation due to the inertia of the drive motor 1 is absorbed by the slip of the friction piece 31, the rotating drum 4 is correctly rotated by 180 °, and the display body 3 is rotated. Since the back surface 3b is directed to the front, the displayed characters can be easily confirmed from the outside.

When the operation switch SW is turned off from this state, the relay R is deactivated and the relay contacts RA, RB
The switching contacts b, b'and the contacts d, d'become non-conductive, and the switching contacts a, a'of the one relay contact RA and the switching contacts c, c'of the other relay contact RB become conductive and switch. An energizing circuit for the contacts a, a ', the detection switch LS1, the drive motor 1 and the switching contacts c, c'is formed, and the drive motor 1 rotates in the reverse direction. This rotation causes the display drum 3 together with the rotary drum 4 to rotate 180 °. It rotates and returns from the operating state to the non-operating state, the operating cam 33 comes into contact with the detection switch LS1, the detection switch LS1 is turned off, and the rotation of the drive motor 1 is stopped. In this case as well, the excessive rotation of the drive motor 1 is absorbed by the slip mechanism 30. Further, the rotation of the drive motor 1 causes the operating cam 33 to move to the other detection switch L.
Since it is separated from S2, the detection switch LS2 is restored to ON, and the state shown in FIG. 7 is obtained.

In the above, if some external force acts on the display body 3 in the inoperative state of the surface display shown by the solid line in FIG. 3, the rotating drum 4 rotates in the clockwise direction shown by the arrow in FIG. It is assumed that the cam 33 is separated from the one detection switch LS1 and both the detection switches LS1 and LS2 are turned on. This is a state in which one of the detection switches LS1 is also turned on in FIG. 7, so that the energizing circuit of the switching contacts a and a ', the detection switch LS1, the drive motor and the switching contacts c and c'is formed and driven. The motor 1 is rotated in the non-operating direction. Therefore, when the external force is released in this state, the rotary drum 4 rotates in the reverse direction, and the display body 3 returns to the inoperative state of the surface display before the external force acts.

Further, in the above, if some external force acts on the display body 3 in the operating state of the backside display shown by the phantom line in FIG. 3, the rotary drum 4 rotates in the direction opposite to the arrow in the figure, and the operation is performed. When the cam 33 is separated from the other detection switch LS2 and placed in the intermediate position where neither of the detection switches LS1 and LS2 abuts, the other detection switch LS2 is also turned on in the state shown in FIG. Therefore, the energizing circuit of the switching contacts b, b ', the detection switch LS2, the drive motor 1, and the switching contacts d, d'is formed, and the drive motor 1 is brought into a rotating state in the operating direction. Therefore, the external force is released in this state. Then, the rotary drum 4 rotates in the forward direction, and the display body 3 returns to the operating state of the back surface display before the external force is applied.

Furthermore, in the above, even if an external force acts on the display body 3 to rotate the display body 3 from the front display state to the back display direction or the opposite direction, the rotation is performed by the slip mechanism 30. Is not absorbed and does not give mechanical damage to the gear transmission mechanism 2 and the like.

Furthermore, in the above embodiment, the rotary drum 4
In contrast, the case where the display body 3 is attached so that it can be inserted is illustrated, but it is needless to say that the display body 3 may be integrally attached to the rotary drum 4 when there is no need to change the display of the display body 3. is there.

Furthermore, in the above-mentioned embodiment, the case where the operation switch is turned on and off by manual operation is illustrated. However, in the case of "in room", "in use", etc., the user has entered the room. At this time, the entry may be detected optically or thermally and the operation switch may be automatically turned on and off by the detection signal.

FIGS. 10 to 14 show another embodiment of the present invention, in which the display effect is improved by illuminating the display body in the operating state of the backside display of the display body 34. The drum 35 includes a plurality of terminal pieces 3 in the fitting portion 35b.
6 is fitted with a holding cylinder 38, which is vertically arranged via a partition 37, and the terminal piece 36 has a facing part which is folded back inward to face the insertion port 39. An elastic holding portion 36a and a terminal portion 36b protruding outward from a slit 40 provided at the center of the rear surface of the holding cylinder 38 are provided at the rear portion. It is needless to say that both the front and back surfaces of the display body may be constantly illuminated in the above case.

Further, as shown in FIG. 14, the display body 34 is provided with an illuminating lamp 42 of an illuminating mechanism 41 inside and "absent", "vacant" or "vacant" on the surface displayed in an inactive state. "Preparing", etc.
A message box in the shape of a horizontal rectangle made of, for example, a milky white resin plate with characters such as "in room", "in use", or "in operation" on the back surface rotated by about 180 ° by N. 43 at the rear end of the insertion port 39
When it is inserted into the terminal portion 36, a connecting portion 44 is held by the elastic holding portion 36a, and a contact piece conductively contacting the elastic holding portion 36a is connected to the connecting portion 44.
Or at least two positive and negative contact pieces 45 are provided.

The control circuit for controlling the rotation of the rotary drum 35 and for illuminating in the operating state of the back side display is shown in FIG.
As shown by 2 and 13, the illumination lamp 42 is connected in parallel to the relay R in the circuit configuration of FIGS. 7 and 8 shown in the embodiment.

When the operation switch SW is closed from the inactive state in which the surface of the display body 34 is oriented in the display direction, the rotary drum 35 rotates 180 ° as described above, and the back surface of the message housing 43. Is displayed, and the illumination lamp 42 connected in parallel with the relay R is turned on to display the message easily by illumination when the backside display is in the operating state.

When the operating switch SW is turned off in order to restore the display body 34 from this state to the inoperative state of the front surface display, the illumination lamp 42 disappears and the rotary drum 35 rotates in the reverse direction. The message casing 43 together with the drum 35 returns from the operating state of the back side display to the inactive state of the front side display, and the rotation of the drive motor 1 is stopped.

It should be noted that, in the above, if any external force acts on the display body 34 in the inoperative state of the back surface display or the inoperative state of the front surface display, the rotary drum 35 is changed from the inoperative state to the operating direction or the operating state. When the external force is released when rotating in the operating direction, the rotating drum 35 rotates in the opposite direction to the above, and the display body 34 returns to the display state before the external force acts. Even if an external force acts on the body 34 to rotate the rotary drum 35 unnecessarily from a predetermined position, the rotation can be absorbed by the slip mechanism 30 and mechanically damage the gear transmission mechanism 2 and the like. In the case of the above-described embodiment, the message housing 43 may be integrally attached to the rotary drum 35 if there is no need to change the display content of the message housing 43. It is like.

In the above embodiment, the message body 43 having the illumination lamp 42 inside is used as the display body 34. However, a plurality of lamps are attached to the outer periphery of the message housing 43 and A display body comprising a control circuit for controlling the blinking of the plurality of lamps, or a display body or a light source formed by arranging a display character itself by a plurality of lamps, and a large number of light guide lines. It is also possible to use a display body or the like that displays only the display characters on the back side, and in the above, the display characters are pictograms or colored characters, or a light source having a colored band is used.
Alternatively, it goes without saying that the front surface and the back surface may be color-coded.

[0029]

As described above, according to the present invention, the back surface and the front surface of the display body are used, and the characters indicating the contents corresponding to the respective surfaces are written, and the written characters are used for the rotary drum 18
Since the display is relatively performed by 0 ° rotation, the display content can be easily and accurately recognized, and the display characters can be effectively written on the surface of the display body. According to the configuration, since the distinction between the operating state and the non-operating state of the display body can be confirmed by the illumination,
The display effect can be remarkably improved, and claim 3
According to the structure described in 4, it is convenient for exchanging display bodies having different display contents, and according to the structures described in claims 5 and 6, the display body can be easily inserted and removed.
The display body can be securely held, and according to the structure of claims 7 and 8, even when the display body is unnecessarily rotated by the action of the external force in the inoperative state or the operating state, the external force disappears. In this case, since the display body is automatically restored to the state before the external force is applied, the reliability of the display function can be obtained with high reliability. Furthermore, according to the configuration of claim 9, the display mechanism is provided by the slip mechanism. Even if an unnecessary external force acts on the body, it has an advantage that it can be used safely without fear of mechanical damage.

[Brief description of drawings]

FIG. 1 is a front view in which a display body is omitted and a part is cut away.

FIG. 2 is a side view in which the display body is omitted and a part is cut away.

[Figure 3] Overall plan view

FIG. 4 is a sectional view of a portion showing a slip mechanism.

FIG. 5 is a plan view showing a gear transmission mechanism.

FIG. 6 is a cross-sectional view of a rotating drum.

FIG. 7 is a diagram showing a control circuit in an inoperative state.

FIG. 8 is a diagram showing a control circuit in an operating state.

FIG. 9 is a front view in which a part of the display body is omitted.

FIG. 10 is a front view in which a display member according to another embodiment is omitted and a part thereof is cut away.

FIG. 11 is a transverse sectional view of a rotary drum according to another embodiment.

FIG. 12 is a diagram showing a control circuit in an inoperative state according to another embodiment.

FIG. 13 is a diagram showing a control circuit in an operating state according to another embodiment.

FIG. 14 is a front view in which a display body according to another embodiment is partially omitted.

[Explanation of symbols]

 1 Drive Motor 2 Gear Transmission Mechanism 3,34 Display Body 4,35 Rotating Drum 5 Control Circuit 6 Substrate 16 Worm 17 Rotating Shaft 18 Worm Wheel 19,20 Gear 21,39 Insert Port 22 Bullet Piece 23 Clamping Piece 25 Auxiliary Member 30 Slip mechanism 31 Friction part piece 32 Repulsion part piece 36 Terminal part piece 36a Elastic clamping part 38 Holding tube 41 Lighting mechanism 45 Contact piece SW operation switch R relay RA, RB relay contact a, a ', b, b', cc ' , Dd 'switching contact 33 actuating cam LS1, LS2 detection switch

Claims (11)

[Claims] 1. A drive motor, a rotary drum that is rotated by the drive motor via a transmission mechanism, and characters attached to the rotary drum and displaying contents facing the opposite surface. A display device comprising: a display body; and a control circuit for controlling the rotating drum in a forward and reverse direction at an angle of about 180 ° so that the surface displaying the opposite content is positioned in the display direction. 2. The display body comprises an illumination mechanism.
Display device described. 3. The display device according to claim 2, wherein the control circuit includes a circuit that energizes the illumination mechanism when the rotating drum rotates in the normal direction and releases the energized state when the rotating drum rotates in the reverse direction. 4. The display device according to claim 1, wherein the display body is detachably attached to the rotary drum. 5. The display body is detachably attached to the rotary drum, and between the rotary drum and the display body,
4. The display device according to claim 3, wherein the control circuit is provided with a connection circuit for connecting the illumination mechanism. 6. The rotary drum is composed of a vertically long member, and a side surface of the rotary drum is provided with an insertion port extending in the longitudinal direction to allow insertion of a base portion of the display body, and the rotary drum is internally inserted into the insertion port. The display device according to claim 4, wherein an auxiliary member including an elastic holding piece for holding the base portion of the display body is provided so that the bullet piece faces the insertion port. 7. The rotary drum is made of a vertically long member, and provided with an insertion port extending in the longitudinal direction on its side surface to allow insertion of the base portion of the display body, and inside thereof, an elastic holding means for holding the base portion of the display body. And a holding cylinder having a terminal portion piece including a terminal portion that electrically connects the control circuit and the illumination mechanism of the display body is provided such that the elastic holding portion faces the insertion port. The display device according to claim 5, wherein the display device comprises: 8. A pair of detection switches, which are always ON and which act relatively to an actuating cam that rotates together with a rotary drum and are in an OFF state at the time of actuation, and a control circuit, which are relatively switched by ON of the actuating switch. A relay having a first contact and a second contact for converting the polarity of the drive motor, wherein the detection switch is connected between the switching contact of the first contact and the both ends of the motor. Claim 1 consisting of
4. The display device according to 4 or 6. 9. A pair of detection switches, which are always ON and which are in an OFF state when the control circuit acts on an actuating cam rotating together with a rotating drum, and which is turned OFF when the actuating cam is actuated. A relay having a first contact and a second contact for converting the polarity of the drive motor, and a circuit for energizing the lighting mechanism by turning on the operation switch,
4. The detection switch is connected between a switching contact of the first contact, which is relatively switched, and both ends of a motor.
The display device according to 5 or 7. 10. A slip mechanism is interposed between a drive motor and a rotary drum to form a slip mechanism.
The display device according to 6, 7, 8 or 9. 11. The transmission mechanism comprises a gear transmission mechanism,
The display device according to claim 10, wherein the slip mechanism is interposed between the gear transmission mechanism and the rotary drum.