JPH07177317A - Device for fixing film on drum - Google Patents

Abstract

PURPOSE:To provide a device for quickly, surely and automatically fixing a film on a drum without folding the film. CONSTITUTION:This film fixing device is provided with a front part pressing- member-operating means 14 for supporting a front part pressing member 3 acting on the front end part of a film by a drum 1 so as to optionally oscillate the member 3 around an axial center P parallel with the axial center of the drum 1, supporting a rear part pressing member 4 acting on the rear end part of the film so as to optionally oscillate the member 4 similarly around the center Q and optionally slide the member 4 in the peripheral direction of the drum 1, exciting the oscillation of the members 3, 4 so that their film pressing ends 3a, 4a come into contact with the outer periphery of the drum 1, and then forcedly oscillating the member 3 oppositely to the drum 1 so as to float the pressing end 3a from the outer periphery of the drum 1 and a rear part pressing member operating means 15 for forcedly oscillating the member 4 slided backwards and sliding the member 4 forwards so as to float the pressing end 4a from the outer periphery of the drum 1 and superpose the floated end 4a to the surface of the rear end part of the film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for winding and fixing various films such as a printing plate of an image recording device and a copy base paper of an automatic facsimile plate making device on a rotatable drum.

[0002]

2. Description of the Related Art Conventionally, a plate fixing device in a printing machine has been known as a typical film fixing device for a drum. In the plate fixing device of this printing machine, two fine grooves are formed on the outer peripheral surface of the drum along the axial direction, and both ends of the plate are bent and inserted into these fine grooves to insert the plate into the drum. It is fixed to the outer peripheral surface of.

[0003]

However, in the above-mentioned conventional apparatus, since both ends of the film are bent and creases are formed, it is inconvenient to handle the film when it is processed in a later step. There is a problem. Further, since it is necessary to perform special fine groove processing on the drum, the processing cost is high, and the fine grooves are likely to cause distortion in the drum. Further, it is difficult to automate the film loading.

Therefore, the applicant of the present invention has a front pressing member that presses the front end portion of the film on the outer peripheral surface of the drum and a rear pressing member that presses the rear end portion of the film on the outer peripheral surface of the drum on a drum that rotates the film. The front presser member and the rear presser member are spring-biased so as to float above the outer peripheral surface of the drum, and the front presser member is held in a predetermined rotational position. The front and rear ends of the film wound on the drum are clamped and fixed by the outer peripheral surface of the drum and the front and rear pressing members, respectively, by automatically operating the bolts of the member and the rear pressing member with the screw tightening mechanism. The device was previously proposed (Japanese Patent Application No. 4-89940).

This screw tightening type film fixing device is
It has an advantage that automation can be achieved because the film end portion is not bent and the front pressing member and the rear pressing member can be clamped and unclamped using a screw tightening mechanism. There was a point to be improved. The high precision alignment of the screw tightening mechanism with respect to each bolt complicates the mechanism and control for this positioning. The bolt rotation operation takes some time, and the time required for loading and unloading the film becomes long. Although the tightening torque of the screw tightening mechanism is set mechanically with a torque limiter, etc., the set value of the tightening torque may change over time due to wear of mechanical parts, etc. Damage or
In order to prevent insufficient tightening, inspection and maintenance are necessary, and it is easy to manage.

The present invention has been made in view of the above circumstances, and it is possible to automatically fix both ends of a film to a drum without bending them, and in particular, to shorten the operation time, Moreover, it is an object of the present invention to provide a film fixing device for a drum, which can easily and surely fix the film without damaging the film.

[0007]

The present invention has the following constitution in order to achieve such an object. That is, the present invention is, in a film fixing device for winding and fixing a film around an outer peripheral surface of a drum, a front pressing member for pressing the front end portion of the film against the outer peripheral surface of the drum, around a fulcrum axis parallel to the drum axis. The drum is equipped with a spring that swingably supports the front pressing member and that urges the front pressing member to swing so that the film pressing end of the front pressing member contacts the outer peripheral surface of the drum. A rear pressing member that presses the rear end of the wound film against the outer peripheral surface of the drum is supported on the drum so as to be swingable around a fulcrum axis parallel to the drum axis and slidable within a certain range in the drum circumferential direction. , A position at which the drum is equipped with a spring for urging the rear pressing member to swing so that the film pressing end of the rear pressing member contacts the outer peripheral surface of the drum. A front pressing member operating means for forcibly swinging the front pressing member at a predetermined position against a spring to float the film pressing end from the outer peripheral surface of the drum; The rear pressing member is forcibly oscillated against the spring so that the film pressing end is floated from the outer peripheral surface of the drum and the floating film pressing end is overlapped on the rear end of the film. And a rear pressing member operating means for advancing and sliding.

[0008]

The operation of the present invention is as follows. With the drum positioned at the origin position, the front pressing member operating means is operated to forcibly swing the front pressing member against the spring, and the film pressing end is floated from the outer peripheral surface of the drum.
The front end portion of the supplied film is also inserted under the film pressing end of the front pressing member. In this state, by releasing the operation of the front pressing member operating means, the front pressing member is urged by the spring to return to swing, and the front end of the film is bent between the film pressing end and the drum outer peripheral surface. It can be clamped and fixed elastically without being. Next, the film is wound around the outer peripheral surface of the drum by rotating the drum, and the rear end portion of the film is positioned near the rear pressing member. In this state, first, the rear pressing member operating means forcibly swings the rear pressing member against the spring so that the film pressing end is floated from the outer peripheral surface of the drum, and then the rear pressing member is lifted. And slide it forward so that the film pressing end overlaps the trailing end of the wound film. After that, by releasing the operation of the rear pressing member operating means, the rear pressing member is urged by the spring to return to swing and elastic without bending the rear end of the film between the film pressing end and the drum outer peripheral surface. It can be pinched and fixed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to plate fixing in a plate image recording apparatus will be described below with reference to the drawings. FIG. 1 is a perspective view showing a schematic configuration of a plate loading portion in which a recording head of a plate image recording apparatus is omitted, FIG. 2 is a plan view showing a part of a front pressing member and a rear pressing member, and FIG. 3 is an operating mechanism. Is a side view, FIG. 4 is a plan view showing a part of the operating mechanism, and FIG. 5 is a front view showing a part of the operating mechanism.

In FIG. 1, reference numeral 1 is a hollow cylindrical drum,
2 is a film based on aluminum as a printing plate which is wound around the outer peripheral surface of the drum 1 and 3 is a front pressing member for fixing the front end of the film 2 to the drum 1,
4 is a rear pressing member for fixing the rear end of the film 2 to the drum 1, and 5 is a front pressing member 3 and a rear pressing member 4.
6 is an operation mechanism for operating the film 2, the film 2 is a drum 1
It is a roller conveyor that feeds and conveys toward.

The drum 1 is set to have a diameter which is slightly longer than the length of the film 2, and is driven in the forward and reverse directions by a motor (not shown). On the peripheral surface of the drum 1, a large number of small holes communicating with the internal space thereof and a plurality of fine grooves connected to the respective small holes are formed. The internal space of the drum 1 is connected to a vacuum suction device (not shown) via a hollow rotary shaft 1a. After the film 2 is wound on the peripheral surface of the drum 1, the internal space of the drum 1 is decompressed by this vacuum suction mechanism, so that the film 2 is suction-held on the peripheral surface of the drum 1. The film 2 is fixed in cooperation.

As shown in FIGS. 1 and 2, the front pressing member 3
Is a laterally long plate-shaped member divided in the axial direction of the drum, the front end of which serves as the film pressing end 3a, and the rear end thereof serves as the operating portion 3b. Then, the fulcrum pin 3c that is driven into and attached to the side end surface of the front pressing member 3 is attached.
To the support member 7 bolted to the outer peripheral surface of the drum 1,
It is swingably supported around a fulcrum axis P that is parallel to the drum axis. Further, by pushing up and urging the operating portion 3b by the compression coil spring 8 mounted so as to be immersed in the outer peripheral surface of the drum 1, the front pressing member 3 is moved so that the film pressing end 3a contacts the outer peripheral surface of the drum. Swing is biased.

Like the front pressing member 3, the rear pressing member 4 is composed of a laterally long plate-like member divided in the axial direction of the drum, and has its front end portion (opposite to the front pressing member 3). )
Is on the film pressing end 4a, and the rear end is on the operation part 4
It is b. Then, the fulcrum pin 4c driven into and mounted on the side end surface of the rear pressing member 4 is swingably supported by a support member 9 bolted to the outer peripheral surface of the drum 1 about a fulcrum axis Q parallel to the drum axis. ing. Further, a fulcrum pin insertion hole 1 formed between the support member 9 and the outer peripheral surface of the drum 1
0 is configured as a long hole that is long in the drum circumferential direction, and the rear pressing member 4 is movable along the fulcrum pin insertion hole 10 in a certain range in the drum circumferential direction. Further, the operation portion 4b is pushed up and urged by the compression coil spring 11 and the ball 12 mounted so as to be immersed in the outer peripheral surface of the drum 1, so that the film pressing end 4a comes into contact with the outer peripheral surface of the drum. 4 is rockingly biased.

As shown in FIGS. 3 to 5, the operating mechanism 5 includes
The drum 1 has a structure in which a front pressing member operating means 14 and a rear pressing member operating means 15 are provided between left and right frames 13 which are vertically fixed on both outer sides of the drum 1. The configuration of each part will be described below. The details will be described.

The front pressing member operating means 14 includes a squeeze roller 16, a support arm 17 supporting the squeeze roller 16 via a roller support shaft 16a, and an upper circular hole 1 of the support arm 17.
7a, an eccentric cam 18 slidably fitted into the eccentric cam, a motor M1 for rotatably driving the eccentric cam 18, and the like. By being guided by 20, the squeeze roller 16 is configured to move far and near with respect to the outer peripheral surface of the drum as the eccentric cam 18 rotates.

The rear pressing member operating means 15 includes a rubber roller 21 and a pair of left and right movable frames 22 pivotally supporting the rubber roller 21.
And a pair of operation levers 23, 24 supporting the movable frame 22, and eccentric cams 25, 5 for rocking the operation levers 23, 24.
5, a motor M2 for driving a cam, a motor M3 for rotationally driving the rubber roller 21, and the like.

The left and right movable frames 22 are connected at their upper ends by a horizontal frame 26 made of a square pipe, and a motor M3 attached to the horizontal frame 26 and a support shaft 27 of the rubber roller 21 have gears 28 and 29. Are linked together. Further, as shown in FIG. 5, the guide roller 30 attached to the extended end of the support shaft 27 and the guide roller 31 attached to the outer surface of the movable frame 22 are engaged with the guide groove 32 formed in the frame 13. The movable frame 22 is configured so as to be movable in a perspective manner in parallel with respect to the drum 1 in a fixed posture.

The operating levers 23 and 24 are rotatably supported about the fulcrum shafts 33 and 34, respectively, and the eccentric cams 25 and 24 act to act on the operating levers 23 and 24, respectively.
55 is fixed to the rotary shaft 35 in the same rotation phase. The motor M2 mounted on the frame 13 and the rotary shaft 35
And are linked by gears 36 and 37.

The free ends of the operating levers 23 and 24 are linked with the upper portion of the movable frame 22 and the upper portion of the horizontal frame 38 by pins, and the movable frames 22 and 38 are interlocked with the swing of the operating levers 23 and 24. Is moved up and down. Further, a plurality of rods 39 extend downward from a horizontal frame 38 provided between the tips of the left and right operation levers 23 on the upper side, and the rods 39 penetrate the horizontal frame 26 of the movable frame 22 and are connected to the rod 39. The rubber roller 21 is attached by the compression coil spring 40 fitted to the outside.
Is elastically biased to the operation portion 4b of the rear end pressing member 4. At this time, the operating lever 24 is separated from the eccentric cam 55, and the elastic force of the coil spring 40 is entirely the rubber roller 21.
Be transmitted to. Note that by making the diameter of the eccentric cam 55 smaller than that of the eccentric cam 25, the operating lever 24 is easily separated from the eccentric cam 55, so that the elastic force is easily transmitted to the rubber roller 21.

As shown in FIG. 5, a film retainer 43 supported via a slide rod 41 and a compression coil spring 42 is mounted on the horizontal frame 26 of the movable frame 22 so as to be elastically retractable and ascendable.

The film fixing device of this embodiment is constructed as described above. Next, the automatic film mounting operation of this apparatus will be described based on the process diagrams of FIGS. 6 to 12 and the flowchart of FIG.

(1) Film Front End Fixing Operation First, as shown in FIG. 6, the drum 1 is moved to a position where the operation portion 3b of the front pressing member 3 faces below the squeeze roller 16.
Is rotated (S1), and then, as shown in FIG.
The squeeze roller 16 is lowered by rotationally driving the motor M1 (S2). As a result, the film pressing end 3a of the front pressing member 3 is floated from the outer peripheral surface of the drum. Here, the roller conveyor 6 is activated to convey the film 2 toward the outer circumference of the drum, so that the front end portion of the film 2 is inserted between the outer peripheral surface of the drum and the floating film pressing end 3a (S3).

When the front end of the film 2 comes into contact with the front end of the support member 7 and is positioned, the roller conveyor 6 is stopped and the squeeze roller 16 is raised by driving the motor M1 in reverse (S4). The front pressing member 3 from which the pressing of the operation portion 3b has been released swings back by the spring 8, and the front end portion of the film 2 is elastically clamped and fixed between the film pressing end 3a and the drum outer peripheral surface. .

(2) Film winding operation When the front end of the film is fixed, the drum 1 is rotated in the winding direction (counterclockwise in the figure) to wind the film 2 around the outer peripheral surface of the drum (S5). ). And
As shown in FIG. 8, when the drum rotation progresses for a set time sufficient for the front pressing member 3 to pass under the squeeze roller 16, the squeeze roller 16 is lowered again,
The film 2 is brought into close contact with the outer peripheral surface of the drum (S6, S
7).

(3) Film trailing edge fixing operation When the winding operation by lowering the squeeze roller 16 has passed the set time, the rotation of the drum 1 is stopped (S8, S9).
In this stopped state, as shown in FIG. 9, the timer is set in advance so that the rear end of the film 2 slightly projects from the squeeze roller 16 and the operating portion 4b of the rear pressing member 4 is located below the rubber roller 21. Has been done.

Next, as shown in FIG. 10, the rubber roller 2
1 to lower the film pressing end 4a of the rear pressing member 4
The surface of the drum. In this case, the film retainer 43 also descends as the movable frame 22 descends, and the rear end portion of the film 2 protruding from the squeeze roller 16 is pressed against the outer peripheral surface of the drum by the retainer piece 43a of the film retainer 43 (S10).

Then, as shown in FIG. 11, the rubber roller 21 is rotationally driven in a predetermined direction (clockwise in the figure), whereby the rear pressing member 4 is slid forward by a certain amount, and the operating portion 4b is moved. The film 2 is overlapped on the rear end (S11). After that, when the rubber roller 21 is moved back up again, as shown in FIG. 12, the rear pressing member 4 in which the pressing of the operating portion 4b is released is oscillated by the spring 11 to return and swing, and the film pressing end 4a and the drum outer peripheral surface are separated. The rear end of the film 2 is elastically sandwiched and fixed between them (S12).

By operating as described above, the film 2
Is wound around the drum 1 without slack, and the front and rear ends thereof are elastically clamped and fixed. When the film 2 is mounted, the film 2 is sucked and held on the drum peripheral surface by the above-described vacuum suction device, and the drum 1 is rotated at high speed.
Image recording is performed on the surface of the film 2 by moving the recording head in the axial direction of.

After the image recording is completed, the operation of removing the film 2 from the drum 1 may be carried out by reversing the mounting operation. The order is shown in the flowchart of FIG. First, as shown in FIG. 12, the drum 1 is rotationally moved until the operating portion 4b of the rear pressing member 4 is located under the rubber roller 21 (S21), and the squeeze roller 16 is lowered to near the rear end portion of the film 2. (S22), the rubber roller 21 is lowered, and the film pressing end 4 of the rear pressing member 4 is pressed.
a is floated and the holding of the rear end of the film is released (S2
3).

Next, by rotating the rubber roller 21 in the opposite direction (counterclockwise in FIG. 12), the rubber roller 21 is rotated.
The rear pressing member 4 that is in contact with the back side is retracted and slid, and is retracted from above the film rear end (S24).

Next, the rubber roller 21 is raised and retracted (S
25) After that, the drum 1 is rotated in the reverse direction (clockwise in the case of FIG. 12), and the free film 2 is fed out (S26). The film 2 sent out from the rear end
Are guided to a guide route for unloading, which is installed separately from the carry-in route.

When the front pressing member 3 approaches the squeeze roller 16 after the reverse rotation of the drum 1 has elapsed for the set time, the squeeze roller 16 is raised (S27, S28), and after that time, the front portion is set for a short time. When the operating portion 3b of the pressing member 3 reaches below the squeeze roller 16, the drum reverse rotation is stopped (S29, S30), the squeeze roller 16 is lowered, and the film clamping by the front pressing member 3 is released (S31). ).

As described above, the film 2 whose both ends have been released is conveyed by driving the conveyor of the guide path for carrying out (S32), and then the squeeze roller 16
Is reset and the film unloading is completed (S3
3).

Incidentally, steps S6, S8, and
In S27 and S29, the rotation position of the drum 1 is detected by the timer, but it may be detected by a signal from an encoder that rotates in synchronization with the rotation of the drum 1.

[0035]

As described above, according to the present invention, it is possible to automatically mount and fix the film on the drum without manpower, but the following effects are particularly exhibited. .

By pressing the front pressing member and the rear pressing member and swinging them against the spring, the film pressing end is released, and the pressing is released to urge and move the film pressing end to move the film end. Since the portions are sandwiched, the film fixing or opening operation can be accurately performed without particularly strictly positioning the pressing position.

Since a time-consuming operation such as screw tightening is not required, it is possible to shorten the operation time of film loading and unloading.

Since the fixing of the film end portion is the elastic holding by the spring, the holding force hardly changes with time, and a proper and stable fixing function is provided for a long period of time without requiring special management. Can be demonstrated.

[Brief description of drawings]

FIG. 1 is a perspective view showing a schematic configuration of a film fixing device according to the present invention.

FIG. 2 is a plan view showing a part of a front pressing member and a rear pressing member.

FIG. 3 is a side view of an operation mechanism.

FIG. 4 is a plan view showing a part of the operation mechanism.

FIG. 5 is a front view showing a part of the operating mechanism.

FIG. 6 is an explanatory diagram of a film front end fixing step.

FIG. 7 is an explanatory diagram of a film front end fixing step.

FIG. 8 is an explanatory diagram of a film winding step.

FIG. 9 is an explanatory diagram of a film rear end fixing step.

FIG. 10 is an explanatory diagram of a film rear end fixing step.

FIG. 11 is an explanatory diagram of a film rear end fixing step.

FIG. 12 is an explanatory diagram of a film rear end fixing step.

FIG. 13 is an operation flowchart of a film fixing process.

FIG. 14 is an operation flowchart of a film discharging process.

[Explanation of symbols]

 1 drum 2 film 3 front pressing member 3a film pressing end 4 rear pressing member 4a film pressing end 8 spring 11 spring 14 front pressing member operating means 15 rear pressing member operating means P fulcrum shaft center Q fulcrum shaft center

Claims (1)

[Claims] 1. A film fixing device for winding and fixing a film around an outer peripheral surface of a drum, wherein a front pressing member for pressing the front end portion of the film against the outer peripheral surface of the drum is oscillated around a fulcrum axis parallel to the drum axis. The drum is equipped with a spring that movably supports the front pressing member and urges the front pressing member to swing so that the film pressing end of the front pressing member contacts the outer peripheral surface of the drum. While supporting the rear pressing member for pressing the rear end of the film on the outer peripheral surface of the drum, the rear pressing member is swingable around a fulcrum axis parallel to the drum axis and slidable within a certain range in the drum circumferential direction on the drum. The drum is equipped with a spring that urges the rear pressing member to swing so that the film pressing end of the rear pressing member comes into contact with the outer peripheral surface of the drum. Front pressing member operating means for forcibly swinging the front pressing member at a fixed position against a spring to lift the film pressing end from the outer peripheral surface of the drum, and the rear part retracting and sliding at a predetermined position. Forcibly swinging the pressing member against the spring to float the film pressing end from the outer peripheral surface of the drum, and the rear pressing member so that the floating film pressing end overlaps the trailing end of the film. A device for fixing a film to a drum, which is equipped with a rear pressing member operating means for advancing and sliding.