JP2543632Y2 - Door opening device for drum type image output device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door opening device and, more particularly, to a door opening device for opening and closing a door which can be opened and closed on a main body case of a drum type image output device.

[0002]

2. Description of the Related Art In a plate making process, a recording unit which is a drum type image output device for exposing and recording an image read by a plate making scanner on a photosensitive film is used. The recording unit includes a recording drum around which a photosensitive film is wound, and a recording head that is arranged to face the recording drum and that exposes and records a halftone image on the photosensitive film. The recording drum and the recording head are covered by a cover, and they are arranged in a dark room.

In a so-called manual winding type recording unit in which a photosensitive film is manually wound, a light-shielding glove is arranged on a cover. An arm is inserted into a dark room through the light-shielding glove, and the recording film in the dark room is placed on the recording drum. Is wound. In addition, during exposure recording, the recording drum is rotating at a high speed, and therefore, if the operator mistakenly inserts an arm from the light-shielding glove while the recording drum is rotating, the recording drum may be injured. For this reason, conventionally, a safety door is provided in front of or behind the light-shielding glove.

In a conventional recording unit provided with a safety door, if the safety door is opened during rotation of the recording drum, an emergency stop is applied to the recording drum, and the rotation state of the recording drum is detected. A configuration in which a door is locked so as not to open is known.

[0005]

When the safety door is opened, an emergency stop is applied to the recording drum. In the above conventional configuration, when the safety door is opened, the recording drum is still rotating. There is a problem that the arm cannot be actually inserted. Further, in the above-described conventional configuration in which the safety door is locked while the recording drum is rotating, the operator may forcibly open the safety door and break the lock mechanism.

An object of the present invention is to make it possible to safely mount a photosensitive film.

[0007]

SUMMARY OF THE INVENTION A door opening device according to the present invention includes a drum having a main body case, a drum rotatably disposed in the main body case, and a door provided on the main body case to be openable and closable. It is used in a model image output device, and includes a handle, a rotation detector, a determiner, and a handle driver. The handle is provided on the door, and can take a posture accommodated in the main body case and a posture exposed from the main body case. The rotation detecting means detects a rotation state of the drum. The determining means determines whether or not the door is in an openable state based on the detection result of the rotation detecting means. The handle driving means exposes the handle means when the determining means determines that the door is in the open-permitted state.

[0008]

In the door opening device of the drum type image output apparatus according to the present invention, the judging means judges whether or not the door is in the openable state based on the rotation state of the drum by the rotation detecting means. Then, when it is determined that the door is in the open-permitted state, the handle means is exposed by the handle driving means.

Therefore, for example, when the drum is rotating at a high speed, the opening is not allowed, the handle means is not exposed, and the door cannot be opened. Then, when it is determined that the opening is allowed, the handle is exposed by the handle driving means, and the door can be opened. In other words, when the drum is in a non-dangerous low-speed rotation, the opening is permitted only when the handle is exposed.At this point, the door lock mechanism is broken or the drum rotates at a high speed when the door is opened. And safety can be improved.

[0010]

FIG. 1 shows a plate-making scanner according to an embodiment of the present invention. In the figure, a scanner 1 has a structure in which a pickup unit 3 and a recording unit 4 are juxtaposed on an upper part of a substantially box-shaped housing 2. The pickup unit 3 mainly includes a document drum 5 formed of a detachable transparent cylinder, and a pickup head 6 provided to face the document drum 5. The pickup head 6 reads an image of a document while being translated in the longitudinal direction by a screw shaft (not shown) provided along the longitudinal direction of the scanner 1.

A recording unit 4, which is an image output device, exposes and records a halftone image on a photosensitive film by using a color halftone signal obtained by performing image processing on an image signal obtained by the pickup unit 3. Things. The recording unit 4 has a recording drum 7 around which a photosensitive film is wound. The recording drum 7 has a structure in which a photosensitive film can be attached by vacuum suction. A recording head (not shown) is provided to face the recording drum 7. The recording head records a halftone image on a photosensitive film while translating in the longitudinal direction. The original drum 5 and the recording drum 7 are driven to rotate by the same driving means.

Since a photosensitive film is mounted in the recording unit 4, it is darkened. For this reason,
The recording unit 4 is covered with a cover 8.
On the front surface of the cover 8, a spectacle-shaped resin-made safety door 9 is provided so as to be freely opened and closed with respect to the cover 8. The central part of the safety door 9 is a handle 9a. At a position facing the safety door 9 of the cover 8, a door storage portion 10 that is recessed inward for storing the safety door 9 is formed. The outer shape of the door storage section 10 is slightly larger than the outer shape of the safety door 9. Note that the gap between the door storage unit 10 and the safety door 9 is approximately several mm. A pair of light-shielding gloves 11 is arranged in left and right circular portions of the door storage unit 10. The light-shielding gloves 11 are dark curtains for darkening the inside of the recording unit 4, from which the arms are inserted when a photosensitive film is mounted. A door opening device 12 is arranged between the light-shielding gloves 11. A door opening switch 13 for opening the safety door 9 is provided at the upper left corner of the cover 8 in FIG.
A lamp 14 indicating that the recording drum 7 is rotating at high speed is arranged.

As shown in FIGS. 2 and 3, the door opening device 12 has a structure in which a solenoid 21, a limit switch 22, a first magnet 23, and a second magnet 24 are vertically arranged. The solenoid 21 releases the holding force of the first magnet 23, and has a spool 21a. The tip of the spool 21a faces the pressing portion 31 protruding inside the safety door 9. The limit switch 22 detects the open / closed state of the safety door 9, and its spool is disposed so as to face a sensing unit 32 protruding inside the safety door 9. First magnet 23
Is disposed to face a metal plate 33 disposed inside the safety door 9 and holds the safety door 9 in a closed state.

The second magnet 24 is arranged to face a second metal plate 34 arranged inside the safety door 9.
The safety door 9 is held partially open. The second magnet 24 is a hinge 2 arranged at the center of the lower surface of the door storage unit 10.
The L-shaped bracket 25 is attached to the end of the L-shaped bracket 25 attached to the bracket 6. The L-shaped bracket 25 is urged leftward in FIG. 3 by a spring 29 wound around a pin 28. At the tip of the spring 29,
A bush 29a is fitted and arranged on the pin 28, and the bush 29a passes through the L-shaped bracket 25. For this reason, the urging force of the spring 29 is transmitted to the L-shaped bracket 25 via the bush 29a, and the L-shaped bracket 25
Is urged to the left in FIG.

The safety door 9 has a hinge 2 partially shown in FIG.
7 supported. The solenoid 21, the limit switch 22, and the first and second magnets are covered by the cover 3.
Covered by 0. The cover 30 is provided to prevent a malfunction such as an operator pressing the spool of the limit switch 22 by mistake. Also,
The cover 30 regulates the turning of the L-shaped bracket 25. That is, the L-shaped bracket 25 is prevented from turning more than a predetermined angle. As shown in FIG. 2, the cover 30 has an opening 41 for inserting the pressing portion 31 and a sensing portion 3.
2 and an opening 43 for viewing the first and second magnets 23 and 24 and the L-shaped bracket 25.

Next, the configuration of a control circuit of the door opening device 12 will be described with reference to FIG. Recording drum 7
Is connected to the encoder 51. Encoder 5
1 outputs 4000 encoder pulses EN in one rotation of the recording drum 7. An encoder 51 is connected to a one-shot multivibrator 53 via an amplifier 52.
Is connected to the input terminal A. The one-shot multivibrator 53 includes a power supply V _{1 connected} to a resistor 54 and a
Connected through. One-shot multivibrator 53 includes one-shot pulses OMQ, / OM having a pulse width corresponding to a time constant determined by resistor 54 and capacitor 55.
Q (/ indicates negative logic) is output at the falling edge of the encoder pulse EN. The output terminal Q outputs a one-shot pulse OMQ of positive logic, and the output terminal / Q outputs an output signal / OMQ of negative logic.

The output terminal Q and the output terminal / Q are connected to the input terminals J and K of the flip-flop 56, respectively. The clock terminal of the flip-flop 56
Encoder pulse EN is given, and clear terminal /
The output terminal Q of the one-shot multivibrator 53 is connected to the CLR. The output terminal / Q of the flip-flop 56 is connected to the photocoupler 58 via the amplifier 57. A power supply V ₁ is connected to the input terminal of the photocoupler 58.
, And a power supply V ₂ is connected to the output terminal. A relay 59 is connected to an output terminal of the photocoupler 58. Contact portions 59a of the relay 59 is connected to the power supply V ₂ through a door opening switch 13. The contact portion 59a is connected to the solenoid 21. In this circuit, when both the door open switch 13 and the contact portion 59a are closed, the solenoid 21 operates and the spool 2
1a is projected.

Next, the opening and closing operation of the safety door 9 of the recording unit 4 configured as described above will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 5 shows a closed state of the safety door 9, and FIG. 6 shows a partially opened state of the safety door 9. After confirming that the lamp 14 has been turned off, the operator operates the door open switch 1
When the switch 3 is turned on, the recording drum 7 is at or below the set number of revolutions, the relay 59 is activated, and the contact portion 59a of the relay is closed, so that the solenoid 21 operates and the spool 21a pushes the pressing portion 31. When the pressing portion 31 is pressed, the holding force of the first magnet 23 is released. First
When the holding force of the magnet 23 is released, the spring 2
9, the L-shaped bracket 25 rotates, and the second magnet 2 attached to the tip of the L-shaped bracket 25
The safety door 9 pivots forward through 4. Then, the safety door 9 is partially opened as shown in FIG. When the operator grips the handle 9a in this state, the holding force of the second magnet is released, and the safety door 9 can be opened to the position shown by the two-dot chain line in FIG.

That is, when the safety door 9 is closed, there is no gap around the safety door 9 such as an operator's place of a finger, so that the operator cannot open the safety door 9.
If the recording drum 7 is below the set number of revolutions when the door release switch 13 is pressed, the relay 59 is on and the first magnet 2 is turned on by the solenoid 21.
3 is released, and the safety door 9 is
Is energized to allow the operator to open the door,
That is, the handle 9a is exposed. Thereby, the safety door 9 can be opened. Also, the safety door 9 is kept closed because the relay 59 is not turned on even if the door open switch 13 is pressed while the lamp 14 is erroneously turned on, that is, while the recording drum 7 is rotating at high speed.

Next, the control operation of the control circuit shown in FIG. 4 will be described with reference to the timing chart shown in FIG. At the falling edge of the encoder pulse EN of the encoder 51, the wasshot multivibrator 53
One-shot pulses OMQ and / OMQ having a pulse width DP determined by a time constant are output. This output is provided to flip-flop 56. In the flip-flop 56,
Since the one-shot pulses OMQ and / OMQ are supplied to the input terminal J and the input terminal K, respectively, and the encoder pulse EN is supplied to the clock terminal, the one-shot pulses OMQ and / OMQ are supplied at the falling timing of the encoder pulse EN. Each OMQ is captured. When the motor is rotating at a low speed at startup, the encoder pulse E
At the falling timing of N, OMQ and / OMQ are "L" and "H", respectively, so that the flip-flop 56 is in the reset state and its output / LOQ becomes "H". However, recording drum 7
Rotates at high speed, and one-shot pulse OMQ, / OM
When the cycle of the encoder pulse EN becomes shorter than the pulse width DP of Q, OMQ and / OMQ are inverted to “H” and “L”, respectively. When OMQ and / OMQ are inverted to "H" and "L", the output / LOQ of the flip-flop 56 changes to "L" at the falling timing of the encoder pulse EN. Further, the recording drum 7 is decelerated, and the cycle of the encoder pulse EN is changed to the one-shot pulse OMQ, / O
When the pulse width DP becomes longer than the pulse width DP of the MQ, the signals at the input terminals J and K change at the falling timing of the encoder pulse EN given to the clock terminal of the flip-flop 56. Changes to "H". When this output is given to photocoupler 58, photocoupler 58 outputs / L
When OQ is “H”, the relay turns on, and the relay 59 turns on. When the door open switch 13 is pressed while the relay 59 is on, the solenoid 21 is excited at the timing when the door open switch 13 is turned on, and the spool 21a is protruded.

Here, the rotation state of the recording drum 7 is detected, and the opening of the safety door 9 is permitted only when the rotation speed is lower than the rotation number determined based on the time constant. Then, the holding force of the first magnet 23 (FIG. 3) is released by the solenoid 21. Then, the safety door 9 is pivoted by a predetermined angle by the spring 28, and the handle 9a of the safety door 9 is exposed. This handle 9
When the operator grips a and releases the holding force of the second magnet 24, the safety door 9 is completely opened.

As described above, while the recording drum 7 is rotating, the opening of the safety door 9 is prohibited, the locking is performed, and there is no space around the safety door 9 for inserting a finger or the like.
Since the handle 9a is not exposed, the safety door 9 cannot be opened. When the opening is allowed, the door turns by a predetermined angle to expose the handle 9a, and the door can be manually opened. At this time, the recording drum 7 is almost stopped, and even if the arm is inserted into the light shielding glove 11 after the safety door 9 is opened and the film is mounted, there is no safety problem.

[Other Embodiments] (a) In the above embodiment, the holding force of the first magnet 23 is released by the solenoid 21. However, since the solenoid has a large electric capacity, when the power supply capacity is not sufficient, Other means can be used. FIG. 8 shows a driving portion of a door opening device 12 according to another embodiment using a motor 61.

The output shaft of the motor 61 with a reduction gear
2 are installed. A one-way clutch 63 is fitted on the tip of the rotating shaft 62. A striker 64 composed of a pair of disks is fitted around the outer periphery of the one-way clutch 63. One way clutch 63
Is for transmitting the driving force of the motor 61 only in one direction, and is arranged so that the striker 64 can freely rotate in the one direction from the outside. A pin 65 is planted on the upper disk of the striker 64 in the figure toward the upper side in FIG. A pin 66 is implanted on the lower disk in the figure toward the lower side in the figure. At the tip of the pin 66,
The other end of the spring 67 having one end fixed is attached. The striker 64 is formed by the spring 67.
Is always urged in the direction in which the spring 67 contracts.
Also, as shown in FIG. 9, a slide pin 68 is provided at a position facing the pressing portion 31 of the safety door 9 so as to be movable up and down in FIG. The slide pin 68 is
Is moved downward in FIG. That is, the same movement as the spool 21a in FIG. 3 is performed. In this embodiment, when the recording drum 7 is rotated at a low speed, when the door release switch 13 is pressed, the motor 61 is rotated, and the pin 65 projects the slide pin 68 to abut the pressing portion 31, and the safety door is opened. 9 is opened against the holding force of the first magnet 23. When the door opening switch 13 is turned off, the motor 61 stops. The stop position at this time is undefined,
The striker 64 stops within a predetermined range due to the urging force of the spring 67, and does not stop at the position where the pin 65 contacts the slide pin 68.

The subsequent operation is the same as in the above embodiment. Also in this embodiment, since it is not necessary to control the stop position of the motor 61, a control circuit similar to the control circuit for controlling the solenoid 21 shown in FIG. 4 can be used. (B) In the above embodiment, the encoder is used as the rotation detecting means, and the one-shot multivibrator and the flip-flop are used as the judging means. However, these are not limited thereto. (C) In the above-described embodiment, the handle and the safety door are integrated, but only the handle may be arranged so as to be exposed and stowable. Then, only the handle may be exposed independently of the safety door.

[0026]

In the door opening device of the drum type image output apparatus according to the present invention, the grip means is configured to be able to take a posture accommodated in the main body case, a posture exposed from the main body case, and the like. It is determined whether or not the door is in the open-permitted state depending on the state, and the handle is exposed when it is determined that the door is in the open-permitted state. The opening is allowed (for example, the drum is at a predetermined rotation speed or less), and there is no risk of injury or the like even when a person touches the drum. Therefore, the film mounting operation can be performed safely.

[Brief description of the drawings]

FIG. 1 is a perspective view of a plate-making scanner employing an embodiment of the present invention.

FIG. 2 is an enlarged front view of the door opening device.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

FIG. 4 is a circuit diagram illustrating a configuration of a control circuit.

FIG. 5 is a schematic sectional view showing a closed state.

FIG. 6 is a schematic sectional view showing an open state.

FIG. 7 is a timing chart of a control circuit.

FIG. 8 is an enlarged rear view showing another embodiment.

FIG. 9 is an enlarged bottom view showing another embodiment.

[Explanation of symbols]

 Reference Signs List 4 recording unit 7 recording drum 8 cover 9 safety door 9a handle 12 door opening device 21 solenoid 29 spring 53 one-shot multivibrator 56 flip-flop 58 photocoupler 59 relay

Claims (1)

(57) [Scope of request for utility model registration] 1. A door opening device for a drum type image output device, comprising: a main body case; a drum rotatably arranged in the main body case; and a door provided on the main body case so as to be openable and closable. A handle provided on the door, which can take a posture accommodated in the main body case and a posture exposed from the main body case; a rotation detection unit for detecting a rotation state of the drum; and the rotation detection. Determining means for determining whether or not the door is openable based on the detection result of the means; and handle driving means for exposing the handle when the determining means determines that the door is openable. And a door opening device for a drum type image output device comprising: