JPH0336470B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an image recording device that records an image on a recording sheet such as a silver halide film on a drum using a light beam modulated by an image signal. It is.

[Prior Art] Conventionally, output images of this type of device have been often used for medical diagnosis purposes. Therefore, in order to eliminate uneven feeding that degrades the quality of recorded images, the recording section
It is necessary to suppress the load fluctuation during image recording, which causes this, and for example, a linear arrangement method as shown in FIG. 10 is adopted. In this conventional device, a take-out mechanism 3 is used to feed the drum 1 from the supply magazine 2 to the drum 1.
The recording sheets that are taken out and fed one by one are sent to the drum 1 via a feeding roller 4 and a guide plate 5, are recorded with a laser beam L by a pressure roller 6, and are then discharged via a guide plate 7. For example, the paper is discharged by the storage roller 8 into a storage magazine. During image recording, the recording sheet S is completely separated from the rollers 4 and 8 on the front and rear of the drum 1, that is, in a state where no force other than gravity is applied, and the recording sheet S is sent along the drum 1 only by driving the drum 1. be. However, this method requires that the distance between the drum 1 and the rollers 4 and 8 be at least the length in the feeding direction of the recording sheet S, which has the disadvantage of increasing the size of the recording section.

Further, the output of this type of apparatus may require recording a plurality of screens P on one recording sheet S, as shown in FIG. but,
The method shown in Figure 10 requires the entire screen to be recorded in one sub-scan, and multiple pieces of image information must be stored together, which has the disadvantage of requiring a large capacity image memory. . Therefore, as shown in FIG. 12, a method may be considered in which the drum 1 is rotated a plurality of times to perform sub-scanning a plurality of times. That is, the range of the laser beam L projected onto the recording sheet is scanned by the scanning optical system 9.
It will be divided according to the following. However, in these multiple sub-scans, the rotational precision of the drum 1 must be extremely high, but in reality, the conventional apparatus cannot achieve sufficient rotational precision.

[Object of the Invention] In view of the above-mentioned drawbacks of the conventional example, an object of the present invention is to reduce the size of the device by adopting a drum system in which a recording sheet is wound around a drum as a recording section, and to utilize the rotation of the drum. This makes it possible to perform sub-scanning with high accuracy any number of times, and thereby, even when recording multiple images on one recording sheet,
An object of the present invention is to provide an image recording device capable of recording high-quality images by reducing the memory capacity for image information and by reducing uneven rotation of a drum.

[Summary of the invention] The gist of the present invention for achieving the above object is as follows:
In an image recording device that performs recording by projecting a light beam onto a recording sheet wound around a cylindrical drum, a feed/discharge roller that transports the recording sheet is driven, and when the recording sheet is wound or removed, A first electric motor for step-driving the drum, a second electric motor for rotating the drum at a constant speed during recording on the recording sheet, and drum drives by the first and second electric motors are fixed to the drum. The first electric motor transmits power to the drum shaft through a clutch, the second electric motor transmits power to the drum shaft through an endless belt, and the second electric motor transmits power to the drum shaft through an endless belt. 2. The image recording apparatus is characterized in that it comprises a control means for disengaging the clutch when the second electric motor is used.

[Embodiments of the Invention] The present invention will be described in detail based on embodiments illustrated in FIGS. 1 to 9.

As shown in FIG. 1, the system configuration of an application example of the present invention includes a control system 10, a supply system 11, and a drum system 1.
2, a storage system 13, and an optical scanner system 14. The control system 10 has a microprocessor and controls the operation of the entire system, and the supply system 1
1 mainly includes a supply magazine 20 that supplies recording sheets S and a sheet take-out mechanism 21. The drum system 12 feeds, writes images on, and discharges the recording sheet S around a drum 22 that can rotate in both directions A and B. The optical scanner system 14 has a laser light source (not shown), a mirror 23, etc., and the storage system 13 has a guide plate 2.
4, discharge rollers 25, 26, sheet pushing mechanism 2
7. It is composed of a storage magazine 28.

FIG. 2 is a side view of the drum system 12, and FIGS. 3 to 7 are structural views of the recording sheet S feeding and discharging mechanism. The drum 22 is a fixed frame 3
0, 30', and the drum shafts 31, 3
1' and bearings 32, 32'. An encoder 33 for detecting the position of the drum 22 is mounted on the drum shaft 31', and balance weights 34, 34' are attached to the inner surface of the drum 22 to balance the weight distribution. A pulley 35 is fixed to the drum shaft 31, and an endless belt 38 with a small inertial mass is stretched between the pulley 35 and a pulley 37 attached to the drive shaft of a writing motor 36. . Further, a sprocket 40 is attached to the drum shaft 31 via a clutch 39, and this sprocket 40 and a feeding roller 4 shown in FIG.
1, 42, 43, discharge rollers 25, 26,
Chain 49 driven by winding motor 48
is being passed over. When the clutch 39 is turned on, the drum 22, feeding rollers 41, 42, 4
3. The number of teeth of the sprocket 40 and the sprockets (not shown) of the roller group are selected so that the discharge rollers 25 and 26 are simultaneously driven by the winding motor 48 and have the same circumferential speed. Further, at the feeding entrance to the drum 22, a detector 5 for detecting the recording sheet S is provided as shown in FIG.
0 is placed.

In FIGS. 3 and 4, a tip chuck member 54 in the form of a spring-loaded hinge is attached to the drum 22 and has a length that allows pressure contact over the entire length of the drum 22. The clamping portion 54a, which is clamped between the circumferential surface of the drum 22 and the circumferential surface of the drum 22, is biased toward the circumferential surface of the drum 22 by a spring. This clamping portion 54a is attached to the drum 22 at a predetermined position on the drum 22 by a tip opening lever 55.
It is designed to be opened from the circumferential surface of 2.
The tip opening lever 55 is rotatable around a shaft 56, and a pressing portion at the tip of the tip opening lever 55 is rotated by a roller 57 attached to the tip opening lever 55 and a cam 59 pivotally attached to a camshaft 58. 55
a makes a predetermined movement, and this movement causes the clamping part 54
Release a.

A shaft 60 is provided near the pressing portion 55a, and a relay lever 61 is rotatably supported on this shaft 60, and the other end is connected to a lever 64 via a connecting shaft 63. connected, lever 6
4 is rotatable around a shaft 65. Therefore, the pressing portion 64a of the lever 64 moves in the same manner as the pressing portion 55a of the tip opening lever 55 as the tip opening lever 55 moves.

Further, a rear end chuck member 70 is disposed on the outer peripheral surface of the drum 22 with a length that allows it to come into pressure contact with the entire length of the drum 22, and both ends of the rear end chuck member 70 are fixed to rectangular plate-shaped support plates 71, 71'. has been done. Support plates 71, 7
1' is configured to be rotatable relative to the drum shafts 31, 31', respectively, and slidably in the radial direction of the drum 22;
1' are always biased in the direction of the drum shafts 31, 31' by springs 72, 72' provided between the drum shafts 31, 31'.

A pin 73 is fixed to the support plates 71, 71', and its tip end falls into a groove 74 provided on the side surface of the drum 22. Furthermore, balance weights 75, 7 are attached to the support plates 71, 71'.
5' is attached so that the drum 22 can maintain a balanced weight distribution during rotation regardless of the position of the rear end chuck member 70. Also,
A slide lever 76 is provided on the frame 30, 30'.
is slidably attached via a shaft 77, and a piece 78 is attached to the tip of the slide lever 76.

A rear end release lever 80 that operates the rear end chuck member 70 is rotatable around a shaft 81, one end of which is fitted into a shaft 82 provided on the slide lever 76, and a roller 83 at the other end. is provided. The roller 83 is adapted to move in contact with a cam 84 provided on the camshaft 58.

Rear end chuck member 70 and front end chuck member 54
A pressure roller 88 is provided between them, and the pressure roller 88 has a length that can press the entire length of the drum 22, and is rotatably attached to one end of a lever 90 that is rotatable about a shaft 89. It is pivoted. A roller 91 is provided at the other end of the lever 90, and the lever 90 is configured to move in contact with a cam 92 that is pivotally attached to the camshaft 58. Further, the lever 90 is biased by a spring in the direction of pressing the pressure roller 88 against the circumferential surface of the drum 22.

Rotatable presser rollers 93, 9 shown in FIG.
Guide plates 24 and 9 4 and 95 are pivotally supported by the frames 30 and 30' and are used to guide the recording sheet S.
6 is fixed to the frames 30, 30'. A rotatable pressing roller 97 is provided on the guide plate 96, and a detector 98 is provided near the guide plate 24 to detect the leading edge of the recording sheet S when it is stored.
is installed. Further, a photo detector 99 is provided near the camshaft 58, and detects the rotational position of the camshaft 58 as described later.

The embodiment according to the present invention has the above-mentioned configuration, and its operation will be explained next. FIGS. 8 and 9 show the operation timing of each mechanism. As the initial position, the drum 22 is stopped at an angle of 0°, and as shown in FIG.
a is separated from the periphery of the drum 22 by the pressure of the tip opening lever 55 via the cam 59. Further, the slide lever 76 is lifted by the cam 84 and the rear end release lever 80, and the rear end chuck member 70 is pulled up via the top 78 and pin 73 provided at the tip thereof. is rotatable independently of the rear end chuck member 70. Further, the pressure roller 88 is stopped at a position slightly away from the circumferential surface of the drum 22 by a cam 92 and a lever 90, and in this state, preparation for winding the recording sheet S is completed.

In FIG. 1, one recording sheet S is taken out from a supply magazine 20 by a sheet take-out mechanism 21 consisting of a vacuum suction cup. Next, the winding electric motor 48 shown in FIG. 2 rotates normally, the feeding rollers 41, 42, 43 move via the chain 49, and the recording sheet S is fed to the drum 22. At this time, the clutch 39 is off and the drum 2
2 is stopped in the initial state. In Figure 3,
When the leading edge position of the recording sheet S is detected by the detector 50 and the leading edge of the recording sheet S reaches the clamping portion 54a of the leading edge chuck member 54, the position shown in FIG.
At this point, the winding motor 48 stops and the recording sheet S also stops. For example, if the winding motor 48 is a stepping motor, the timing of this stop can be controlled by counting a predetermined number of pulses after the detection signal from the detector 50. Here, in response to a drive signal to the camshaft 58, the camshaft 58 is rotated by a cam drive motor (not shown) from the state shown in FIG. 9A to the state shown in FIG. 9B. That is, the pressing portion 55a of the tip opening lever 55 is separated from the tip chuck member 54, and the clamping portion 54a of the tip chuck member 54 is pressed against the circumferential surface of the drum 22 as shown by the dotted line in FIG. Hold the tip of the

Further, the pressure roller 88 moves via the lever 90 by the operation of the cam 92, and presses the recording sheet S against the circumferential surface of the drum 22. Next, in response to a signal from the photo detector 99 that detects the position of the shaft 33, the clutch 39 is turned on and the winding motor 48 starts to rotate normally, and the feeding rollers 41, 42, 43, the discharging roller 25, 26 rotates, and the drum 22 begins to rotate counterclockwise in the A direction. Therefore, recording sheet S
With its tip end chucked by the tip chuck member 54, it is pressed against the drum 22 by the pressure roller 88 and wound around the circumferential surface of the drum 22. When the drum 22 is moved to a preset position, that is, when the rear end of the recording sheet S reaches below the rear end chuck member 70 as shown in FIG. 48 is stopped.

Subsequently, a drive command to the camshaft 58 causes the camshaft 58 to rotate to the position shown in FIG. 9c. The rear end chuck member 70 is pressed against the peripheral surface of the drum 22 via a cam 84, a rear end release lever 80, and a slide lever 76, and chucks the rear end of the recording sheet S. At this time, the slide lever 76 and the support plate 39
The tip of the pin 73 connecting the two falls into the groove 74, and the other end is connected to the slide lever 76.
The pin 73, together with the rear end chuck member 70, follows the drum 22 and becomes rotatable.
Further, the pressure roller 88 is moved away from the circumferential surface of the drum 22 by a cam 92 and a lever 90, as shown by arrow C in FIG. The winding of the recording sheet S around the drum 22 is completed.

This state corresponds to FIG. 8d, in which the clutch 39 is turned off and the writing motor 36 begins to rotate, causing the drum 22 to further rotate in the direction A. When the leading edge of the recording sheet S reaches the writing position detected by the encoder 33 shown in FIG. 2, that is, the state shown in FIG. 8e, writing on the recording sheet S is started using the optical scanner system 14. This writing is drum 2
2 is rotated as it is, and the end of writing is commanded by a position signal of a predetermined position of the drum 22 or an end signal from the outside.
In the state shown in FIG. 8f, the writing motor 36 stops and the drum 22 stops.

Regarding the operation of collecting the recorded recording sheet S, first, the clutch 39 is turned on at the position shown in FIG.
rotates clockwise in direction B to the state shown in Figure 8g. When the position returns to this position, that is, the positional relationship shown in FIG. 5, the cam shaft 58 rotates to the position shown in FIG. Release the rear end of the recording sheet S away from the circumferential surface.

Next, when the winding motor 48 rotates the drum 22 in the direction A to the predetermined state shown in FIG.
Its rear end is directed toward the guide plate 24 as shown in FIG. 6 due to its elastic restoring force. Next, drum 2
When the recording sheet S is rotated in the direction B, the rear end of the recording sheet S is pushed out and guided into the guide plate 24 by the tip chuck member 54, and the discharge sheet S is rotated at the same peripheral speed as the drum 22. roller 25,
26 and sent to the storage magazine 28.

Rotatable presser rollers 93, 94, 95, 97
This prevents the recording sheet S from bulging, and also allows the drum 22 to smoothly return from a curved state to a flat surface on the circumferential surface of the drum 22. When the tip chuck member 54 reaches the predetermined state of FIG. 8i, that is, the state shown in FIG. 7, the winding motor 48 is stopped and the drum 22 is also stopped. Next, the camshaft 58
The camshaft 58 rotates to the state shown in FIG. is separated from the circumferential surface of the drum 22, and the recording sheet S is released from the drum 22.

Then, the winding electric motor 48 rotates in response to the signal shown in FIG. At this time, the clutch 39 is off and the drum 22 remains stationary. When the recording sheet S is stored in the storage magazine 28, the camshaft 58 rotates until it is in the state shown in FIG.
is released from the pressing portion 64a of the lever 64. Next, the winding motor 48 is rotated by the signal shown in FIG. 9f from the photo detector 99, the clutch 39 is turned on, and the drum 22 is rotated in the direction B, to the initial position shown in FIG. Return to state m. and,
The drive signal to the camshaft 58 causes the camshaft 58 to move to the ninth position.
When it rotates to the initial state shown in Figure a, the front chuck member 54, the pressure roller 88, and the rear end chuck member 70 also become initial states, and the entire operation is completed.

It goes without saying that the present invention is not limited to the embodiments only, and that many modifications can be made within the scope of the claims.

[Effects of the Invention] As explained above, the image recording apparatus according to the present invention uses a winding electric motor to drive a complicated rotational system with large inertia related to feeding and ejecting a recording sheet, and At the writing operation stage using the beam, an unnecessary inertial system is separated, and only the minimum necessary inertial system consisting of a well-balanced drum wrapped with a recording sheet is driven by the writing motor, thereby achieving a stable circumferential speed. This makes it possible to obtain high-quality images, form multiple images, and downsize the device.

[Brief explanation of drawings]

Figures 1 to 9 show an embodiment of the image recording apparatus according to the present invention, in which Figure 1 is a system configuration diagram, Figure 2 is a side view of the drum drive system, and Figure 3 is a side view of the drum drive system.
7 to 7 are structural diagrams related to the feeding and ejection of the recording sheet S, FIGS. 8 and 9 are timing charts of the detection mechanism and operating mechanism, and FIG. 10 is an explanation of the conventional linear arrangement method. 11 is an explanatory diagram of a recording sheet, and FIG. 12 is an explanatory diagram of multiple recording using a drum system. 10 is a control system, 11 is a supply system, 12 is a drum system, 13 is a storage system, 14 is an optical scanner system, 2
0 is a supply magazine, 22 is a drum, 25, 26 are discharge rollers, 28 is a storage magazine, 30, 3
0' is a frame, 36 is a writing motor, 39 is a clutch, 41, 42, 43 are feeding rollers, 48
54 is a winding electric motor, 54 is a tip chuck member, and 55 is a winding electric motor.
58 is a front end release lever, 58 is a camshaft, 70 is a rear end chuck member, 71 and 71' are support plates, 76 is a slide lever, 80 is a rear end release lever, 88 is a pressure roller, and S is a recording sheet.

Claims (1)

[Claims] 1. In an image recording device that performs recording by projecting a light beam onto a recording sheet wound around a cylindrical drum, a feed/discharge roller that transports the recording sheet is driven, and the recording sheet is wound and removed. A first electric motor that drives the drum in steps during recording, a second electric motor that rotates the drum at a constant speed when recording on the recording sheet, and the drum driving by the first and second electric motors drives the drum. through a fixed drum shaft,
Power is transmitted by the first electric motor to the drum shaft through a clutch, power is transmitted to the drum shaft by the second electric motor through an endless belt, and when the second electric motor is used, the An image recording device comprising: control means for disengaging a clutch.