JPH0380386B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION This invention relates to a drum drive device used in a multicolor enlarging printing device or the like.

Conventional technology In a multicolor enlarging printing device, a recording material such as paper, cloth, metal, etc. is wound around a large rotating drum, and ink is directly jetted onto this material using a spray gun or the like to record a large screen. . It is used to create background screens for stage equipment, large wall advertisements, etc.

The drum drive device in such a large-sized recording apparatus has conventionally been constructed as shown in FIG. The rotating drum 1 is the rotating shaft 2 of the motor 2.
It is rotated by a sprocket chain 3 that is stretched between the rotating shaft 1a of the drum 1 and the rotary shaft 1a of the drum 1.
Sprockets 6 and 7 equipped with line density switching clutches 4 and 5 are fixed to the rotating shaft 1a of the drum 1, and between each sprocket 6 and 7 and sprockets 9 and 10 fixed to the lead screw 8, , sprocket chains 11 and 12 are spanned over. A moving table 13 equipped with a recording section (not shown) is screwed to the lead screw 8 arranged parallel to the drum 1.
As a result of the rotation, the movable table 13 moves linearly in a reciprocating manner to perform recording on the drum 1.

On the other hand, if a large screen is too large, handling becomes inconvenient, so recording may be performed by dividing the screen into two. In this case, the configuration is such that devices as shown in FIG. 2 are arranged in parallel. That is, the rotating drums 1 are arranged coaxially, and the motor 2, drive system,
The movable tables 13 and the like are provided independently.

Problems to be Solved by the Invention In such a recording device, the rotating drum 1
Unless the rotation of the moving table 13 and the movement of the moving table 13 are synchronized, a good image cannot be obtained. There is no problem when the drum 1 is a single drum, but when the drum 1 and the movable stage 13 are driven separately for two-part recording, it is necessary to align the recording on one drum with the recording on the other drum. Synchronization becomes difficult.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an improved drum driving device that can satisfactorily synchronize recording on each drum in a multi-drum type image recording apparatus.

Means for Solving the Problems The drum drive device according to the present invention includes a motor for driving each drum separately, and a switch for selecting one of these motors and transmitting power to a common moving platform. It has a power transmission system with a latch.

Function: Each drum is rotationally driven by a separate motor, and when recording on one drum, power is transmitted from the motor driving it to the moving platform via the switching clutch, and recording is performed on the other drum. When the moving platform is connected to the motor that drives it via another switching clutch,
In both recordings, the rotation of the drum and the movement of the moving platform are synchronized.

Embodiment FIG. 1 shows an embodiment of the invention. The rotating drums 21 and 22 are arranged coaxially and are rotationally driven by motors 25 and 26 via sprocket chains 23 and 24, respectively.
Sprockets 27 and 28 are fixed to rotating shafts 25a and 26a of each motor 25 and 26, and a sprocket 3 fixed to rotating shaft 30 of power transmission system 29 and having switching clutches 31 and 32 is fixed to rotating shafts 25a and 26a of each motor 25 and 26, respectively.
Sprocket chain 35, 3 between 3, 34
6 is crossed. A worm 37 is fixed to a rotating shaft 30 of the power transmission system 29, and a worm wheel 39 is meshed with the worm 37, which is fixed to an intermediate shaft 38 disposed perpendicular to the rotating shaft 30. The intermediate shaft 38 has gears 4 with different diameters.
0, 41 are fixed, and each gear 40, 41 is fixed to an output shaft 42 disposed parallel to the intermediate shaft 38, and a line density switching clutch 43, 44, respectively.
The gears 45 and 46 are meshed with each other. A toothed drive pulley 47 is fixed to the tip of the output shaft 42, and this drive pulley 47 is connected to the guide pulley 4.
It is meshed with a timing belt 50 that is stretched between 8 and 49. A moving table 51 equipped with a recording section (not shown) is fixed to the timing belt 50.

Next, the operation of this device will be explained. First, the motor 25 is driven by the input of a control signal, and when the drum 21 starts rotating by the sprocket chain 23, the switching clutch 31 is activated in the power transmission system 29, and the driving force of the motor 25 is transferred to the sprocket chain 35, Worm 37, worm wheel 39 and gears 40, 45 or 41,
46 to the drive pulley 47. gear 4
0, 45 or gear 41, 46 selection is gear 4
Line density switching clutch 4 built in 5, 46
This is done by switching between 3 and 44. When the drive pulley 47 rotates, the timing belt 50 moves, and the moving base 5 fixed to the timing belt 50 moves.
1 moves to the drum 21 in synchronization with the rotation.

When the recording on one drum 21 is completed, the switching clutch 32 in the power transmission system 29 is activated, and the driving force of the motor 26 that rotationally drives the other drum 22 is transmitted from the sprocket chain 24 to the worm 37. The moving table 51 is driven through a similar path in synchronization with the rotation of the drum 22.

In the above embodiment, the movable table 51 is driven by the timing belt 50, but this may be done by using a lead screw as shown in FIG. 2, or by using other driving means. You may use it. Further, the configuration of the power transmission system 29 can be variously modified using known techniques.

Effects of the Invention As described above, in the drum driving device according to the present invention, since a plurality of drums are connected to a common moving platform via one power transmission system, the rotation of each drum and the movement of the moving platform are controlled. It is possible to reliably synchronize and improve the consistency of both images when recording is performed separately on a plurality of drums. Furthermore, since the power transmission system is integrated into one and the moving platform is also shared, the configuration is simplified and space can be saved.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view of a drum drive device showing an embodiment of the present invention, and FIG. 2 is a schematic perspective view of a conventional drum drive device. 21, 22... Rotating drum, 25, 26... Motor, 29... Power transmission system, 31, 32... Switching clutch, 47... Drive pulley, 50... Timing belt, 51... Moving platform.

Claims (1)

[Claims] 1. A power transmission comprising a plurality of coaxially arranged rotating drums, a plurality of motors for separately driving each of the rotating drums, and a switching clutch connected to each of the motors to select one of the motors. A drum driving device comprising: a drive system; and a movable table having a recording section that is driven by the power transmission system and performs recording on each of the drums.