JPH0786277B2 - Partition unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a partition unit.

[Problems to be Solved by Conventional Techniques and Inventions]

Conventionally, a partition unit is composed of a partition wall portion and a desk top plate portion inside the partition wall portion, and it is necessary to install a separate drafting table inside the partition wall for a drafting partition. Therefore, the drawing compartment and the other office compartments have completely different configurations, and it has been difficult in the past to share them. In addition, the drafting table has a supporting leg for the floor-mounting base, and there is a problem that it interferes with the leg during drafting. Further, in a small office or the like, a drafting space and an office space other than the drafting space are separately required, which causes a problem that the total required floor area is increased.

[Means for Solving the Problems]

The present invention is provided with a partition wall structure having at least left and right partition side walls, a drawing board having a drawing board and a drawing instrument attached thereto is provided so as to be capable of moving up and down on the partition wall structure, and
A plurality of rotors as fixed pulleys pivotally attached to the partition wall structure, and a flexible suspension suspended by the rotors, one end of which is fixed to a drawing board and the other end of which is fixed to the side wall. Member, a flexible suspension member suspended from the rotor and having one end fixed to the drawing board and the other end fixed to the side wall, and a movable pulley suspended near the other ends of both flexible suspension members. The above-mentioned drawing base is suspended so as to be able to move up and down by a pulley mechanism including a rotor as the above, and one end is fixed to the partition wall structure and the above-mentioned rotor as the movable pulley is pivoted at the other end. An elastic means for constantly elastically pressing the rotor against the weight of the drawing board, the drawing machine and the drawing board is internally provided in the wall or column of the partition wall structure. And reduce the weight of the drafting board, drafting machine and drafting board by the elastic means. It is obtained by attaching a motor to the interlocked shape 該滑 gear mechanism.

Further, the pulley mechanism has a plurality of rotors as constant pulleys, flexible suspension members, and rotors as movable pulleys, one pair each on the inner surface of the left and right partitioning side walls. ,
A synchronous shaft 16 is provided which connects a pair of left and right rotors to synchronize the vertical movements of the left and right edges of the drawing board, and further, through a drive transmission mechanism that transmits rotational drive force to the synchronous shafts, an electric motor and An interlocking connection was made with the synchronous shaft.
Further, the elastic means is constituted by connecting two or more gas springs in series. In addition, the number of rotors and the number of moving pulleys as the constant pulley of the pulley mechanism are adjusted so that the ratio of the vertical stroke of the elastic means to the vertical stroke of the drawing board is (1: 2 ⁿ ) (where n is a natural number). The number of rotors was set.

[Work]

The drafting board to which the drafting board and the drafting machine are attached is attached to the partition wall structure by a pulley mechanism (without using the supporting legs of the conventional drafting table). The elastic means reduces (balances) the own weight of the drawing board, the drawing machine and the drawing board, and the electric motor can be moved up and down sufficiently even if it has a small size and small horsepower. With this,
The electric motor and its drive transmission mechanism can be easily incorporated in the wall or ceiling of the partition structure (invisible to the outside).

Since the supporting leg of the conventional drafting table is eliminated, the lower space can be freely used for various purposes, and it does not interfere with the operator's leg.

In addition, the synchronous shaft can be moved up and down by synchronizing the left and right lifting strokes to keep the drawing board horizontally. By interlocking the electric motor with the synchronous shaft, the left and right balance can be more easily balanced.

Also, by using an elastic means in which two or more gas springs are connected in series, they can be easily stored inside the partition side wall, etc., and a standard stroke gas spring is used to provide a sufficient drawing base. Lifting stroke can be obtained. Further, the ratio of the vertical stroke of the elastic means to the vertical stroke of the drawing board is (1: 2 ⁿ ) (where n is a natural number).
Therefore, the required stroke of the elastic means is 1/2 ⁿ
It's done.

〔Example〕

 Hereinafter, the present invention will be described in detail based on embodiments of the drawings.

1 to 6, 1 is a drawing base, 2 is a partition wall structure, which is provided with left and right partition side walls 3, 3 and a rear partition back wall 4, and Is a drawing board 5
Is attached to the drawing board 5, and the drawing board 6 is attached to the drawing board 5.
(Shown in FIG. 5 and FIG. 5).

As shown in phantom in FIG. 7, the rear wall 4 can be omitted in the present invention. That is, it is sufficient to have at least the left and right side walls 3, 3. However, a ceiling rod 7 for connecting the left and right side walls 3, 3 and a connecting rod (girder) near the rear wall are required.

The drawing board 1 includes a main body 8 which is always horizontal, a drawing plate mounting member 10 which is pivotally supported by a shaft 9 near the front edge of the main body 8, and a tilting drive means A (9th embodiment). (See Figure and Figure 10).

Then, the drafting base 1 is provided so as to be able to move up and down in the internal space 11 of the partition wall structure 2, and the drafting base 1 is stored in the upper storage state U (the third space) close to the ceiling 7 of the internal space 11. FIG. 5 and FIG. 5), and the vertical range S in the drawing use state B (see FIG. 1 and FIG. 4 or FIG. 2) —in FIG. 1, the drawing is based on the upper surface of the drawing board 5 in the horizontal state. Elevating means C (see FIG. 6 and FIG. 7) for elevating and lowering is provided.

As shown in FIG. 9, the drafting plate 5 is tilted back and forth within a predetermined angle range θ by the tilting drive means A. For example, from the horizontal state, the maximum forward tilt angle θ is set to about 75 °. FIG. 1 shows a state in which the drawing board 1 (and therefore the drawing board 5) is lowered to the lowest limit and is used for drawing work in the angle range θ from the solid line to the imaginary line.

And, as is clear from FIG. 1, FIG. 3, and FIG. 8, the front edge 5a of the drawing board 5 and the front edge 1a of the drawing board 1 are respectively more than the front edges 3a, 3a of the partition side walls 3, 3. The relative dimension and relative position of the drawing board 5 and the side walls 3, 3 are set so as to be located rearward. Of course, the rear edge 5b of the drawing board 5 and the rear edge 1b of the drawing board 1 are set so as to be located in front of the rear edges 3b, 3b of the side walls 3, 3, respectively.

In addition, here, the front edge when the side wall 3 has a pillar member
The 3a and the trailing edge 3b are defined as the ones that include this column member.

Next, 12 is a first illumination lamp provided on the ceiling portion 7 of the partition wall structure 2, and in the illustrated example, three fluorescent lamps are attached along the front edge of the ceiling portion 7. Further, a second lamp 13 for illuminating the lower side of the drawing board 1 is provided (as in FIGS. 1 to 3) on the drawing board 1. In the illustrated example, a pair of two fluorescent lamps is attached to the left and right to form the second lighting lamp 13.

Then, in FIG. 6 and FIG. 7, the partition wall structure 2
The drawing board 1 provided therein can be lifted and lowered by being suspended via a pulley mechanism 14. Here, the pulley mechanism 14 is suspended on the rotors 18, 19, 20, 21, 22 as a plurality of constant pulleys pivotally mounted on the partition wall structure 2 and the rotors 21, 20, 19 thereof. With one end 15a fixed to the drawing board 1 and the other end 15b
A flexible suspension member 15 fixed to the side wall 3 and the rotor.
A flexible suspending member 24 suspended from 18, 22 and having one end 24a fixed to the drawing board 1 and the other end 24b fixed to the side wall 3.
And a rotor 23 as a moving pulley that is hung near the other ends 15b and 24b of the flexible suspension members 15 and 24. Also, the pulley mechanism
A plurality of rotors 18,19,20,21,22 as constant pulleys, flexible suspension members 15,24 and a rotor 23 as a movable pulley are provided on the inner surfaces of the left and right partition side walls 3,3. , Each has a pair, and
The pulley mechanism 14 includes a synchronous shaft 16 that connects a pair of left and right rotors 19 and 19 to synchronize the vertical movement of the left and right edges of the drawing board 1.

That is, the rotors 18, 18 are attached to the upper portions of the front edges 3a, 3a of the side walls 3, 3, and the rotors 19, 22 are pivotally supported by the rear edges 3b, 3b so as to be close to each other. , 22 rotate together. Also rotor 20
Are arranged above and above the rotor 19, and the rotor 21 is arranged above and behind the rotor, respectively. The rotor 20 provides tension to other flexible suspension members 24 (described below).

Numeral 25 is an elastic means in which two or more gas springs 26, 26 are connected in series-in the same axial center-shape. The pair of left and right elastic means 25, 25 are rotors 19, 19. Of the rear wall 3,3 as shown by an imaginary line E in FIG.
It is desirable that the elastic means 25 is internally provided inside the pillar defined as being included in a part of 3 and 3, and is not exposed to the outside. A rotor 23 as a moving pulley is pivotally attached to the lower ends of the gas springs 26, 26 as the elastic means 25. That is, the elastic means 25 has one end fixed to the partition wall structure 2 and the other end to which a rotor 23 as a moving pulley is pivotally attached, so that the rotor 23 can be drawn by the drawing board 5 and the drawing device 6. It is constantly and elastically pressed in a direction against the weight of the base 1.

The flexible suspension members 24, 24 have one end 24a, 24a at the drawing base 1
It is fixed to the front end portions of the left and right front extending portions 27, 27 via connecting pieces 28, 28. In addition, each of the flexible suspension members 24, 24,
After reaching the rotor 23 through the rotors 18 and 22, the rotor 23 is inverted by 360 ° and the other end 24b is fixed to a part of the side wall 3. Further, the other flexible suspension members 15, 15 each have one end 15a fixed to the trailing edge of the drawing base 1, reach the rotor 23 as a movable pulley through the rotors 21, 20, 19, respectively. Here, the other end 15b is inverted by 360 ° and fixed to a part of the side wall 3.

Thus, the rotors 18 to 23 are made of chain wheels, pulleys and the like, and the flexible suspension members 15 and 24 are made of strips or the like having concave and convex meshing parts, such as chains and toothed belts.

After all, the symmetrical rotors 18 to 23, the flexible suspension members 15 and 24, etc., which are internally provided in the left and right side walls 3 and 3, respectively, include the synchronous shaft 16 which is internally provided near the rear edge of the ceiling portion 7. Synchronize with the drawing base 1
Can be raised and lowered while keeping horizontal without tilting to the left or right. Then, the elastic means 25 reduces the total weight of the drawing board 5, the drawing machine 6, and the drawing board 1.

If the configurations of FIGS. 6 and 7 described above are described by different expressions, it can be said that the elastic means 25 and the drawing base 1 are interlockingly connected via the pulley mechanism 14.

Then, an electric motor 29 is interlockingly connected to a synchronous shaft 16 forming a part of the pulley mechanism 14 via a drive transmission mechanism 33.

In the illustrated example, a rotary drive wheel 30 such as a chain wheel or pulley is fixed to a part of the synchronous shaft 16, and a (similar) drive wheel 31 of the output shaft of the electric motor 29 is connected to a chain or a toothed belt. The endless flexible member 32 is suspended to form the drive transmission mechanism 33 that transmits the drive rotational force to the synchronous shaft 16.

As is apparent from FIG. 6, the ratio of the vertical stroke S'of the elastic means 25 and the vertical stroke S of the drawing board 1 is 1: 2. That is, the ratio of the vertical stroke S'of the elastic means 25 and the vertical stroke S of the drawing board 1 is (1: 2 ⁿ ).
The number of rotors 18, 19, 20, 21, 22 as constant pulleys of the pulley mechanism 14 and the number of rotors 23 as movable pulleys are set so that (where n is a natural number). Of course, if the number of moving pulleys and constant pulleys (corresponding rotor) of the pulley mechanism 14 is increased,
(S ': S) can be (1: 4), (1: 8), etc. In other words, S ': S = 1: 2 ⁿ (where n is a natural number) is set.

Next, in FIGS. 7 and 11, 34 is a detector such as an encoder for detecting the ascending / descending position of the drawing board 1 as the rotational position (number) of the synchronous shaft 16. An illumination control device 35 for illuminating the first illuminating lamp 12 and the second illuminating lamp 13 by the signal p from the detector 34 is provided. In FIG. 11, the signal p is once input to the illumination control device 35 via the comparison means 36.

As shown in FIG. 1, when the raising / lowering position of the drafting base 1 is shown in the upper and lower positions of the upper surface of the drafting plate 5 attached thereto (horizontal state), the first lighting lamp 12 has the entire raising / lowering stroke S. Lights up from the lower limit L of the above only within the range of the first stroke F,
Further, the second illumination lamp 13 lights up only in the range of the second stroke G downward from the upper limit T of the entire lifting stroke S, and F> (1/2) .SG> (1/2). S is set so that the first and second illumination lamps 12 and 13 are controlled to have an overlapping area W in which they are both lit.

Therefore, in FIG. 11, the illumination lighting / extinguishing position setting means 37
And a storage means 38 for storing and holding the set input value from now on, and the signal a from this storage means 38 is input to the above-mentioned comparison means 36 and compared with the signal p from the detector 34. After that, the signal b is sent to the lighting control device 35, from which the signal c,
By sending d to the first and second illumination lamps 12 and 13, respectively, the lighting and extinguishing are controlled as shown in the explanatory graph of FIG.

In other words, when the drawing board 1 is in the upper storage state U shown in FIG. 3, the first lamp 12 is turned off and only the second lamp 13 is turned on. Further, the intermediate drawing use state B shown in FIG. 2 to the lower drawing use state B shown in FIG.
When there is the drawing board 1, the second lamp 13 is turned off and the first lamp 12 is turned on instead.

In addition, in FIG. 1, generally, a person (not shown) sits in a chair to perform drawing work, and in FIG. 2, generally, the person stands in an imaginary line to perform drawing work (or a tall person sits in a chair). Drafting work), and Fig. 3 (or Fig. 5)
Then, since each is used to perform desk work (general office work) at the desk (table) 39 provided in the lower portion of the internal vacant space 11, each lighting effect is effective without waste.

Further, the first and second illumination lamps 12 and 13 both light up at the time of up / down switching between FIG. 2 and FIG. 3, and the transition area (overlap area W) in FIG. It is. With such an overlapping area W, the interior of the partition unit of the present invention can always maintain the brightness even when the entire room is dark.

In the examples of FIGS. 1 to 3, the synchronous shaft 16, the electric motor 29, the drive transmission mechanism 33, and the like are housed in a sheet metal hollow box 40 having a substantially rectangular cross section. This hollow box 40 has a ceiling 7
Corresponds to the horizontal girder that forms part of. Further, the partition side wall 3 is composed of pillar members 41, 42 of metal molds having a hollow chamber at the front edge 3a and the rear edge 3b thereof, and the elastic means 25, the rotor 23, and the flexible suspension member in FIG. 15, 24 and the like are housed in the pillars 41, 42 and are not exposed to the outside, and safety and aesthetics are improved.
43 are longitudinal slits that open to the inner surfaces of the column members 41 and 42, and the connecting piece 28 shown in FIGS. 7 and 4 moves up and down along the slit 43.

Further, in the upper storage state U shown in FIGS. 3 and 5, the drawing board 5 is automatically controlled so that it is always in the horizontal state. It is designed to be widely available. However, FIGS. 1 and 2
In the drawing-making use state B shown in the drawing, the drawing board 5 can be tilted at a desired angle by the tilting drive means A.

Further, in the example of FIGS. 1 to 5, the desk 39 is of a system fixed to the partition wall structure 2, and in addition to this, a rearranging portion such as a drawer can be attached. On the contrary, it is preferable that such a desk 39 or the like is not provided in the lower portion of the internal vacant chamber 11 and a separate desk, a storage box, an OA device or the like can be freely installed (not shown).

Further, the operation panel 44 provided with various switches in FIG. 11 is
As shown in FIG. 4, a part of the drawing board 1 is provided, and a part of the switches is provided in the operation panel 45 on the lower inner surface of the side wall 3 in FIGS. 1 to 3.

As shown in FIG. 6, two or more gas springs 26, 26 are connected in series, and the pulley mechanism 14 connects the gas springs 2 to each other.
Since the total stroke of 6,26 is (1/2 ⁿ ) (where n is a natural number), a short gas spring 26, which is easily available, is used, and a sufficiently large lifting stroke S (see FIGS. 1, 2, 4 (See the figure).

In FIGS. 6 and 7, it has been already described that the simultaneous shaft 16 is attached to synchronize the vertical movement of the left and right. However, the synchronous shaft 16 is used for the electric motor 29 and the drive transmission mechanism 33. It is rational in that the driving is performed with the point that the left and right synchronization is not impaired and that an average force is applied to the left and right flexible suspension members 15, 24. Further, there is an advantage that it can be easily housed in the ceiling portion 7 and the side walls 3, 3 do not partly project.

Then, FIGS. 9 and 10 specifically show an example of the tilting drive means A for tiltingly driving the drawing board 5 within the predetermined angle range θ. In the figure, 46 is a screw shaft which is rotatably supported in the front-rear horizontal direction and is rotatable, and a rotor 47 is fixed to one end thereof. Reference numeral 48 is an electric motor, and a flexible member 49 such as an endless toothed belt or a chain is suspended between the rotor 48a fixed to its output shaft and the rotor 47. Reference numeral 50 denotes a nut member that is screwed into the screw shaft 46 so as to be able to advance and retract, and the support shafts 51, 51 projecting from the nut member 50 to the left and right are extended upward in the forward direction by a push-up arm 5.
2, 52 are pivotally attached, and the front ends of the push-up arms 52, 52 are pivotally attached to the drawing plate mounting member 10 by pins 53, 53.

In the horizontal state of the solid line in FIG. 9, the nut member 50 is located at the rear end of the screw shaft 46, and when the electric motor 48 of FIG. 10 is rotated in the forward direction, the nut member 50 advances and finally becomes an imaginary line. As shown in the drawing, the drawing plate mounting member 10 and the drawing plate 5 move to the front end of the screw shaft 46 via the push-up arm 52 and tilt about the shaft center of the shaft 9, for example, a maximum tilt angle θ of about 75 °. Becomes On the contrary, if the electric motor 48 is rotated in the reverse direction, it returns to the horizontal state. The tilt drive means A is housed in the flat box-shaped main body 8 made of a hollow sheet metal except for the upper half portion of the pressing arm 52.

Then, in FIG. 11, the shaft 9 is fixed to the clevis 54 and tilted integrally with the drawing board 5, the rotor 55 is fixed to the shaft 9, and the rotation angle detector 56 such as an encoder and the endless. A flexible member 57 such as a toothed belt is interlocked and coupled, and the output signal (pulse signal) e from the detector 56 feedback-controls the electric motor 48.

Further, FIG. 11 shows a schematic block diagram for raising / lowering control of the drawing board 1 and tilting control of the drawing board 5. As is apparent from the figure, a storage means 38 is provided and the storage means 38 is provided. For 38, various setting means 58,59,60,61,62,6
3,37 are connected. In particular, the position setting means 59 can preset the memory positions 1, 2, 3 ... And the height of the drawing board 5 corresponding to the typical (standard) drawing postures shown in FIGS. 1 and 2. The position and the tilt angle can be organically combined and set. In addition, by providing the user position setting means 58, it is possible to preset the preferred drawing posture according to the user's preference and the size of the body. All of these are stored in the storage means 38.

Further, the command signals from the various operation command switches 64, 65, 66, 67 are connected so as to be input to the storage means 38, and the signal a from the storage means 38 is sent to the comparison means 36. Feedback signals p and e from detectors 34 and 56 such as pulse oscillators such as encoders are input to the comparison means 36. The signals f and g from the comparison means 36 are sent to the lifting control device 6
8 and the tilt control position 69 respectively, the signals h, i are respectively sent from the respective control devices 68, 69 to the electric motors 29, 48 to drive the synchronous shaft 16 etc. and the screw shaft 46 etc., respectively, Control up and down and tilt respectively. The above signal p,
The value e is fed back to the comparison means 36 and stops when it operates up to a predetermined target value. At this time, the signal b is also sent from the comparison means 36 to the illumination control device 35 (as described above).
Is sent, and the upper and lower first and second illumination lamps 12 and 13 are ON / OFF controlled.

The operation panel 44 shown in FIG. 4 has switches 64 to 67 shown in FIG.
Etc. and (if desired) a digital display of the height and tilt angle of the drawing board 5 is provided.

The present invention is not limited to the illustrated embodiment, and the design can be freely changed. For example, as the partition wall structure 2, a front wall with a sliding door or a door is further added (although it has already been described that it is sufficient to have at least the side walls 3 and 3) to surround four sides. It is also possible to use the tilt drive means A, and it is also possible to tilt the drawing plate mounting member 10 by transmitting a rotational torque to the shaft 9 itself (instead of the screw shaft 46 etc.). Various types of drawing machines 6 can be freely attached. The elastic means 25 may be replaced with a coil spring or the like.

〔The invention's effect〕

The present invention has the following significant effects with the above configuration.

Can be installed on the floor area of a conventional drafting stand, and
It can be effectively used three-dimensionally for drawing work and other things.

Below the drafting plate 5, there is no member corresponding to the supporting leg of the conventional drafting table, and the legs of the body can be freely assembled.
It is easy to work, and an office desk, a organizer, etc. can be freely installed in the lower space.

The elastic means 25, the electric motor 29, and the pulley mechanism 14 can be hidden and stored inside the wall surface of the partition wall structure 2, the ceiling portion 7 or the like, and have a neat appearance, are easy to use, and are safe. Is high.

By using the elastic means 25 together, the electric motor 29
Etc. can be made small and have low horsepower, which is advantageous.

The drawing board 1 can always be maintained in a horizontal state, and the drawing board 5 can be easily used.

By connecting two or more gas springs 26, 26 in series as the elastic means 25, a standard short stroke gas spring can be used. In other words, a fairly large lifting stroke S is required to raise the ceiling 7 to the vicinity thereof, but a short stroke gas spring 26 ... It can be planned. Furthermore, by setting the ratio of the vertical stroke S ′ of the elastic means 25 to the vertical stroke S of the drawing board 1 to be (1: 2 ⁿ ), the length of the elastic member can be further reduced. is there.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention and also for explaining the operation, FIG. 2 is a side sectional view showing an example of a drawing-use state, and FIG. 3 is a side view showing an upper storage state of a drawing board. Sectional view, FIG. 4 is a front view showing an example of drawing use state, FIG. 5 is a front view in a state corresponding to FIG. 3, FIG. FIG. 8 is an overall plan view, FIG. 9 is an enlarged side view of an essential part, FIG. 10 is its plan view, and FIG. 11 is a block diagram showing an example of a control method. 1 ... Drafting base, 2 ... Partition wall structure, 3 ... Partition side wall, 3a ... Front edge, 5 ... Drafting plate, 5a ... Front edge,
6 ... Drafting machine, 11 ... Internal vacant space, 12 ... First illumination light, 13 ... Second illumination light, 14 ... Pulley mechanism, 16 ... Synchronous shaft, 25 ... Ejection means, 26 ...... Gas spring, 29 ...
… Electric motor, 33 …… Drive transmission mechanism, 34 …… Detector, 35
...... Lighting control device, A ... Tilt drive means, B ... Drawing use state, C ... Lifting means, S ... Vertical range (elevating stroke), S '... Vertical stroke, U ... Upward storage state , Θ: angular range, n: natural number, p: signal.

Claims (4)

[Claims] 1. A partitioning wall structure 2 having at least left and right partitioning side walls 3, 3, a drawing board 1 having a drawing board 5 and a drawing machine 6 attached thereto is provided on the partitioning wall structure 2 so as to be vertically movable. , A plurality of rotors 18, 19, 20, 21, 22 as fixed pulleys pivotally attached to the partition wall structure 2, and one end 15a suspended on the rotors 21, 20, 19 and a drawing base 15a. 1
A flexible suspension member 15 fixed to the side wall 3 and the other end 15b thereof and the one end 2 suspended from the rotors 18 and 22.
A flexible suspension member 24 having 4a fixed to the drafting base 1 and the other end 24b fixed to the side wall 3 and the other end 1 of both flexible suspension members 15 and 24.
A drafting mechanism 1 provided with a rotor 23 as a moving pulley hanging near 5b and 24b suspends the drafting base 1 so as to be able to move up and down, and one end thereof is fixed to the partition wall structure 2. At the same time, the rotor 23 as a movable pulley is pivotally attached to the other end so that the rotor 23 is constantly and elastically pressed in a direction against the weight of the drawing board 5, the drawing machine 6 and the drawing board 1. Means 25,
In the wall portion or column portion of the partition wall structure 2, internally contained,
A partitioning unit characterized in that the weight of the drawing board 5, the drawing machine 6, and the drawing board 1 is reduced by the elastic means 25, and an electric motor 29 is attached to the pulley mechanism 14 in an interlocking manner. 2. A pulley mechanism 14 divides a plurality of rotors 18, 19, 20, 21, 22 as constant pulleys, flexible suspension members 15, 24, and a rotor 23 as a movable pulley into left and right partitions. The synchronous shaft 16 has a pair on the inner surfaces of the side walls 3, 3 and the pulley mechanism 14 connects the pair of left and right rotors 19, 19 to synchronize the vertical movement of the left and right edges of the drawing board 1. 2. The partition unit according to claim 1, further comprising: an electric motor 29 and the synchronous shaft 16, which are interlocked with each other via a drive transmission mechanism 33 that transmits a rotational drive force to the synchronous shaft 16. 3. The partition unit according to claim 1, wherein the elastic means 25 comprises two or more gas springs 26, 26 connected in series. 4. A constant pulley of the pulley mechanism 14 so that the ratio of the vertical stroke S'of the elastic means 25 and the vertical stroke S of the drawing board 1 is (1: 2 ⁿ ) (where n is a natural number). The partition unit according to claim 1, wherein the number of rotors 18, 19, 20, 21, 22 and the number of rotors 23 as moving pulleys are set.