JPS5922432B2 - Clamping device for wrapping paper around a rotating drum - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clamping device for wrapping paper around a rotating drum.

For example, a drum on which a facsimile original or recording paper is wound, or a drum on which a master of an offset printing machine is wound, is conventionally provided with a clamping device that holds only the leading edge of the paper.

In this case the trailing edge of the paper is free. As a result, the trailing edge of the paper inevitably floats above the drum surface, resulting in inconveniences in reading and recording, noise generation, and image distortion. The present invention seeks to obviate the above-mentioned drawbacks in conventional clamping devices.

Embodiments of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, a paper feed roller 3 is arranged above a paper feed table 2 on which sheets 1 of a certain size are stacked and stored. When feeding paper, the paper feed roller 3 rotates in the direction of the arrow, and the paper feed tray 2
rotates clockwise around the pivot 2A, and the paper feed roller 3 comes into contact with the uppermost sheet of the paper feed tray 2, so that the paper feed tray 2
Feed out the topmost sheet inside. The sent-out uppermost sheet 1A is guided by a guide plate 4 and a stopper 5, and further passes through a guide plate 8 having a pair of feed rollers 6 and 7 on both sides, and then its leading end is connected to a light source lamp 9 and a light receiving element 10. The paper reaches a paper detection device 11 consisting of. When the paper detection device 11 detects the leading edge of the sheet 1A, the rotation of the paper feed roller 3 stops and the paper feed tray 2
As the sheet 1A descends, the feeding action of the sheet 1A is interrupted, and the sheet 1A stops at a predetermined position and waits. The feed rollers 6 and 7 face each other across an opening 8A provided in the guide plate 8, and as will be described later, approach each other as necessary to further feed the sheet 1A waiting in between. An optical reading device 13 or a recording device and a paper ejection device 14 are arranged around the drum 12 on which the paper is to be wound. 15 is a paper discharge table.

The drum 12 is provided with a paper leading edge holder 16 and a paper trailing edge holder 17 extending over its entire width.

As shown in FIG. 2, the paper leading end presser 16 is a support rod 18 that is inserted into the drum through a notch that spans the entire width of the drum 12.
The support rod 18 is pivotably mounted around a support shaft 19. The support rod 18 extends over the entire width of the drum together with the paper leading edge retainer 16, and one end of each of tension springs 20 and 21 is engaged with both ends of the support rod 18 on both sides of the drum 12, and these springs The other end is locked to a pin fixed to the drum 12 (see Figures 2 and 4). As a result, the support rod 18 and the paper leading edge holder 16 are rotated counterclockwise in FIG. 2 and clockwise in FIG. It is always under the action of being closed to the circumferential surface of 12. As shown in FIG. 4, the control lever 22 is pivotally mounted on a fulcrum 23, and is provided with a step 22A for locking the support rod 18. Furthermore, branch 18
A leaf 24 is fixed to the control lever 22, and a tension spring 25 is engaged with the control lever 22, giving the control lever a pivoting behavior in the direction in which it touches the support rod 18. Again in Figure 2,
A cam disk 26 is fixed to the shaft 12A of the drum 12, and a control plate 27 is loosely attached.

The cam disk 26 is provided with a recess 26A, and the control plate 27 is provided with control projections 27A and 27B on both sides thereof. The control protrusion 27B provided on the inside of the control plate 27 is such that the support rod 18 is the second one.
It is arranged to abut against this when in the closed position shown. The same cam disk 26 is provided at the other side end of the drum. FIG. 3 shows a control mechanism for the paper trailing edge restraint 17.

A paper restraining support lever 28 is pivotally connected to a fulcrum 29 and includes a protrusion 28A that engages with a recess 26A of the cam disk 26. The tip of the paper holding support lever 28 can be locked to a stepped portion 31A of an intermediate lever 31 that is pivotally connected to a fulcrum 30, and this intermediate lever 31 is further secured to this via a pin 32 and a slit 33. and is engaged with the lever 34. The intermediate lever 31 has an engaging portion 31B for receiving control from the outside, and the lever 34 has a bent portion 34A that abuts against the control protrusion 27A of the control plate 27. The paper holding support lever 28, the intermediate lever 31, and the lever 34 are
As shown by broken lines in FIG. 2, it is attached via each fulcrum to a support plate 35 loosely attached to the drum shaft 12A. As shown by broken lines in FIG. 4, members corresponding to the paper holding lever 28, the intermediate lever 31, and the supporting plate 35 supporting these are also provided at the other side end of the drum. The same symbols are attached. In FIG. 5, a solenoid 37 is attached to one of the side plates 36 supporting the drum 12 and others,
The plunger 38 is engaged with one arm end of a double-armed lever 39 via a pin 38A and a slit 39A fixed thereto.

The other arm end of the double-arm lever 39 is adapted to engage with an engaging portion 31B of the intermediate lever 31 shown in FIG. 3 through its pawl portion 39B. 40 is a tension spring that engages with the plunger 38, and the other end is engaged with a pin fixed to the side plate 36.

The support shaft 41 of the double-arm lever 39 extends parallel to the axis of the drum 12 to the other side plate, and is fixed to a double-arm lever of the same shape and function arranged on the same side plate. In FIG. 8, the feed roller 7 is rotatably mounted on a support lever 44 mounted on a fulcrum 43, which lever 44 is acted upon by a tension spring 45 and a solenoid 46.

Furthermore, they are connected to each other by a spring 47 and have fulcrums 48 and 49, respectively.
Two levers 50 and 51 are provided, and these levers abut each other at an arm 50A provided on the lever 50. The lever 50 includes an adjustable pin 52 which is located on the track of the leaflet 24 when it protrudes from the outer circumference of the drum. The lower end of the lever 51 is a stepped portion 51
A, and the same step portion engages with a pin 44A provided on the lever 44. Reference numeral 53 denotes a switch disposed at a position where it can be engaged with the tip of the protruding control lever 22, and is used to control the solenoid 46 as described later.

The operating mode of the device described above is as follows.

As described above, the leading end of the sheet 1A is detected by the paper detection device 11 and the sheet 1A is stopped and waiting, and at this time the solenoid 37 shown in FIG. 5 is energized and its plunger 38 is retracted. A double-arm lever 39 is connected to the plunger 38 via a pin 38A and a slit 39A.
The bent claw portion 39B, which is in a position rotated counterclockwise about the support shaft 41 against the action of the tension spring 40 and extends in the direction of the engaging portion 31B of the double-arm lever 39, is shown in FIG. It engages with the engagement portion 31B of the intermediate lever 31 shown. Therefore, the support plate 35 shown in FIG. 2 stops, and further, in FIG. 3, the stepped portion 31A of the intermediate lever 31 engages with the tip of the paper presser support lever 28, and the intermediate lever 31, pin 32, and The bent portion 34A of the lever 34, which is engaged through the slit 33, is in a position where it abuts against the control protrusion 27A of the control plate 27. Therefore, the control plate 27, which has been rotating due to frictional contact with the drum shaft 12A, is also stopped when its control protrusion 27A hits the bent portion 34A.

By engaging the tip of the paper presser support lever 28 with the stepped portion of the intermediate lever 31, the paper trailing edge presser 17 is in the open position where it is raised above the circumferential surface of the drum 12, and the protrusion 28A of the paper presser support lever 28 is held in a position where it does not engage with the recess 26A of the cam disc 26. The above description is the same on the other side end side of the drum 12 shown in FIG. 4, and this state is shown by broken lines in FIG. 4. In this case, the paper leading end retainer 16 is in a closed position in contact with the circumferential surface of the drum 12, as shown in FIGS. 2 and 4. In the above-mentioned state, the drum 12 is indicated by the arrow 42.
When rotating in the direction shown in FIG. 6, the support rod 18 hits the control protrusion 27B of the control plate 27 which is stopped at this time, and is rotated about the support shaft 19 as shown in FIG.

At this time, as shown in FIG.
is held in this position by its radially inward end being engaged with the step 22A of the control lever 22 at the other end thereof. Therefore, the paper leading edge presser 16 opens as shown in FIGS. 6 and 6 and continues to rotate while maintaining this state. The leaf-like body 24 of the support rod 18 is the paper tip presser 1
6 is in the closed position, it is retracted inward from the drum circumferential surface (Fig. 4), but when the paper leading edge presser 16 is in the open position, it is retracted outward from the drum circumferential surface (Fig. 4). It is in a protruding state (FIGS. 7 and 8). Therefore, when the drum 12 continues to rotate in this state, the leaf-like body 24
As shown, the pin 52 is engaged and the lever 50 is pivoted counterclockwise about its fulcrum 48. Waist spring 47
Under the action of the arm 50A of the lever 50, the lever 51 also pivots counterclockwise about its fulcrum 49, so that its step 51A is attached to the pin 44 of the support lever 44.
It deviates from A. Therefore, the support lever 44 is supported by the tension spring 45.
The feed roller 7 that it supports rotates clockwise around the fulcrum 43 under the action of the other constantly rotating feed roller 6.
The sheet 1A, which is in the vicinity of and waiting between the two, is sent out. The speed at which the sheet 1A is fed by the pair of feed rollers 6 and 7 is slightly higher than the circumferential speed of the drum 12, and the leading edge of the fed sheet 1A enters the back side of the paper leading edge holder 16, which is open at this time. After the sheet 1A enters the back side of the paper leading end presser 16, the feeding action by the feeding rollers 6 and 7 is released as follows. control lever 22
The tip of the switch 53 operates the actuator of the switch 53, and after a certain period of time has elapsed from this operation, the solenoid 46 is energized and the support lever 44 is turned counterclockwise. The stepped portion 51A of the lever 51 and the pin 44A of the support lever 44 are engaged again as shown in FIG. 8, and the feed roller 7 is separated from the feed roller 6, so that the feeding action of the sheet 1A is stopped. Immediately after the tip of the control lever 22 moves the actuator of the switch 53, the tip of the control lever 22 hits the fixing pin 55 and is pivoted around its fulcrum 23 against the action of the spring 25, so that the support rod 18 The lever 22 is disengaged from the stepped portion 22A, and the support rod 18 returns to the closed position of the paper leading edge presser 16 shown in FIGS. 2 and 4 under the action of the springs 20 and 21. At this time, the leading edge of the sheet 1A on the back side of the paper leading end holder 16 is caught by the holder 16, and thereafter is held by this holder 16 and carried away. In the above-mentioned process, the tip of the middle paper holding support lever 28 engages with the stepped portion 31A of the middle lever 31, so even if the concave 26A of the cam disk 26 passes under it, its protrusion 28A will not move. never get depressed. The paper leading edge restrainer 16 catches the leading edge of the sheet 1A, and at this time, the paper passes through the stopped paper trailing edge restrainer 17.

In this embodiment, the trailing edge of the paper trailing edge restrainer 17 contacts the circumferential surface of the drum 12 and acts to stretch the sheet 1A passing under it. As mentioned above, the paper leading edge presser 16 is the paper trailing edge presser 1.
Immediately after passing under 7, the energization of the solenoid 37 is interrupted, and the double-arm lever 39 is rotated clockwise via the plunger 38 under the action of the spring 40, thereby causing its pawl 39B and the intermediate lever to rotate. 31, the intermediate lever 31 is rotated slightly counterclockwise around its fulcrum 30. As the intermediate lever 31 rotates as described above, the stepped portion 31A disengages from the tip of the paper presser support lever, and the lever 34 is rotated clockwise via the pin 32 and the slit 33. Therefore, the bent portion 34A comes out of the running path of the control protrusion 27A of the control plate 27. This state of each member is shown in broken lines in FIG. At this time, the projection 28A of the paper holding lever 28 slides on the outer periphery of the cam disk 26. Therefore, when the drum 12 continues to rotate and the leading edge holder 16 of the paper reaches directly below the trailing edge holder 17 again, and therefore the recess 26A of the cam disc 26 reaches just below the protrusion 28A of the paper holder support lever 28, This time, the protrusion 28A is the spring 5
4 into the recess 26A. At this time, the protrusion 28
Since A is forcibly lowered by the action of the spring 54 along the leading slope of the V-shaped recess 26A, the support lever 28 and the support plate 35 that supports it are forced to rotate slightly counterclockwise. Ru. Therefore, the intermediate lever 31 and its engaging portion 31B, which are also supported by the support plate 35, also rotate counterclockwise, and as a result, the engaging portion 31B and the pawl portion 3 of the dual-arm lever rotate.
The engagement with 9B is released. As mentioned above, the protrusion 28A
By falling into the recess 26A, the support lever 28 is rotated counterclockwise around the fulcrum 29 by the action of the spring 54, and the paper trailing edge holder 17 is brought to the closed state. At this time, the rear end of the sheet 1A is just below the paper trailing edge holder 17, and the holder 17 bites the rear end of the sheet 1A. In this way, the leading edge and the trailing edge of the sheet 1A are held by the paper leading end restrainer 16 and the paper trailing edge restraint 17, respectively, and stable holding of the sheet 1A around the drum 12 is ensured. While the sheet 1A is rotating together with the drum 12 with its leading and trailing ends being held down,
It will be scanned by an optical reader 13 or a recording device. The paper holding positions of the paper leading edge presser 16 and the paper trailing edge presser 17 do not necessarily have to match as in this embodiment.
It is also possible to perform this at different outer peripheral positions of the drum 12. After the reading process or the recording process is completed, the solenoid 37 (FIG. 5) is energized again, and the claw part 39B of the double-arm lever 39 moves into the travel path of the engaging part 31B of the intermediate lever 31, and rotates. It engages with the coming engagement portion.

As a result, the support plate 35 and the paper presser support lever 28, intermediate lever 31, and lever 34 attached thereto are stopped, and the protrusion 28A of the paper presser support lever 28 comes out from the recess 26A of the control plate 26 and extends around it. Slide on the surface. The paper trailing edge holder 17 is brought into an open state by the paper holder support lever lifted up in this manner, and its tip is again pressed against the stepped portion 31 of the intermediate lever 31.
A, and the bent portion 34A of the lever 34 is placed on the control plate 27.
of the control protrusion 27A. Control projection 27A
The control plate stops when it hits the bending portion 34A,
Then, as the support rod 18 abuts against the control protrusion 27B, the paper leading edge presser 16 becomes open as described above.
As a result of opening the front and rear ends of the sheet 1A, the sheet 1A
is ejected onto the paper ejection stand 15 by the ejection device 14. As described above, the clamping device of the present invention also suppresses the leading and trailing ends of the sheet to be wrapped around the rotating drum circumferential surface, so that the sheet is almost certainly brought into close contact with the drum circumferential surface, and it is possible to read or read the sheet. It has become possible to eliminate the inconvenience of having to make records.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of a facsimile reading device to which the clamping device of the present invention is applied, Fig. 2 is an end view of the drum showing the paper leading edge holding mechanism, and Fig. 3 is an end view of the same drum showing the control mechanism for holding the trailing edge of the paper. , FIG. 4 is an end view of the drum on the other side showing the paper leading end restraining mechanism, FIG. 5 is a front view of the side where the control solenoid of the paper trailing edge restraining control mechanism and its drive mechanism are installed, and FIGS. The figure is an explanatory diagram of the paper leading edge holding and releasing process, No. 8
The figure is an explanatory diagram showing the relationship between the paper leading edge restraining mechanism and the paper feeding mechanism. 1,1A... Sheet, 12... Drum, 16...
Paper leading edge presser, 17... Paper trailing edge presser, 28... Paper presser support lever, 26, 26A, 31, 34, 37, 39.
...Support lever control mechanism.

Claims (1)

[Claims] 1 Paper leading edge restraint 16 arranged around the drum; Paper leading edge restraint opening means 27, 27B that opens the paper leading edge restraint by rotation of the drum to introduce the leading edge of the paper; Paper leading edge restraint opening that holds the paper leading edge restraint in an open state. A state holding means 22A, a paper feeding force applying means biasing unit that operates the paper feeding force applying means 6 and 7 when the drum rotates while maintaining the open state and the opening of the paper leading end restraint reaches the paper feeding position; Means 44, 45, 50
, 51, 52; After the leading edge of the paper is introduced into the paper leading edge holder, the holding of the open state is released and the paper leading edge holder is closed. Paper leading edge pressing and closing means 22, 55; The paper leading edge holder is closed. paper feeding force release means 53, 46 for releasing the bias of the paper feeding force applying means; paper trailing edge presser 17 that takes both open and closed positions with respect to the circumferential surface of the drum; paper is wound around a rotating drum; In the clamp device for attaching the paper, the support means 28 supports the paper trailing edge holder; the paper trailing edge holding means 31 engages with the supporting means to hold the paper trailing edge holder in an open state; 31A, 31B; Paper leading edge restraining opening force control means 27A, 3 which interlock with the paper trailing edge restraining and opening holding means and engage with the paper leading edge restraining and opening means in this opened state.
4; The paper trailing edge restraint supporting means 28, the open state holding means 31, 31A, 3 so that the paper leading edge restraint holding the leading edge of the paper passes under the paper trailing edge restraint as the drum rotates.
1B and the opening force control means 27A, 34 are kept in a fixed state relatively immovable with respect to the rotational movement of the drum, and after the paper leading edge restraint passes the paper trailing edge restraint, the paper trailing edge restraint is maintained in the open state. At the same time, the paper leading edge holding/opening means 2 is released.
fixing/releasing means 37, 38, 39, 40 for disengaging the opening means from the paper leading edge holding/opening force control means in order to move the opening member 7, 27B in accordance with the rotation of the drum; In the released state, the paper trailing edge holder is held in the open state, and when the trailing edge of the paper reaches the paper trailing edge introducing opening of the paper trailing edge holder, the supporting means 28, the opening state holding means 31, and the paper trailing edge holder are held open. The opening force control means 34 is released from the fixed state so as to rotate together with the drum, and after the reading or recording process is completed, when the fixing and releasing means 37, 38, and 3940 are biased to the fixed state, the fixing and releasing means Holding, releasing, recovery and holding control means 26, 26A, 28A for recovering and holding the open state in the released state; A clamping device for wrapping paper around a rotating drum, characterized in that a paper trailing edge holder 17 is located at a position where the sheet carried by the paper leading edge holder 16 can be pressed against the circumferential surface of the drum to perform a squeezing action.