JPS5928104B2 - Seat rear end clamp device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for clamping the rear end of a sheet that is wound around a rotating drum.

2. Description of the Related Art A facsimile machine is known as a device that uses sheets wound around a rotating drum. In this facsimile machine, a document sheet or a recording sheet is wound around a drum and each sheet is scanned.

And, such a facsimile machine
41, Utility Model Publication No. 47-30484, or Special Publication No. 56-35343, etc.) One of them will be briefly explained. The sheet fed by
The sheet is held by the sheet end presser claw provided on the drum side, and is wrapped around the drum circumference as the drum rotates.
The rear end of the sheet is held between the solid surface of the drum by a presser plate that moves toward the center of the drum. It has a configuration that allows

By the way, when wrapping a sheet around the circumferential surface of a rotating drum, the leading end can be easily clamped with a gripping claw, but the rear end stops the pressing plate rotating together with the drum and wraps the sheet around the drum circumferential surface. After pulling the sheet away from the surface and passing the sheet under it, when the rear end of the sheet reaches the bottom of the press plate by the drum circuit, the press plate is brought into pressure contact with the drum circumferential surface again and rotated. Although it is designed to be clamped, when each end of the pressing plate is to be stopped or released, it is necessary to do this at the same time without making a mistake. If this fails and only one of them is stopped or released, the press plate will be twisted as the drum rotates, causing problems in clamping the rear end of the sheet and damaging the press plate. There is.

SUMMARY OF THE INVENTION An object of the present invention is to provide a reliable sheet trailing edge clamping device that eliminates the above-mentioned drawbacks that occur when winding a sheet around a drum used in a facsimile machine or the like.

The present invention will be explained below with reference to the illustrated embodiments.

In FIG. 1, a drum 1 around which a sheet is wound is constantly rotating in the direction of arrow 2, and upper and lower members 3,
The flange portions 3a and 4a provided on the respective portions 4 are in pressure contact with each other. A pressing plate 5 for pressing the trailing edge of the sheet is in pressure contact with the circumferential surface of the drum along its generatrix, and each end of the plate V1 is fixed to an open ring 6, 7 as shown in FIG. There is. The rings 6, 7 are connected at each end by springs 8, 9, respectively, and are connected to the drum 1.
The springs 8, 9 are fitted into the stepped portions 1a, 1b of the springs 8, 9.
The pressure force of the press plate against the circumferential surface of the drum is exerted by the elasticity of the press plate. As shown in FIG. 3, the rings 6 and 7 are fixed to the flange portions 3a of the upper and lower members 3 (the other is not shown), and are pressed against the stepped portions 1a and 1b, respectively. }, therefore, the upper and lower members 3, 4
The hexagram and pressing plate 5 normally rotate together with the drum 1 in the direction of the arrow 2. A mechanism shown in FIG. 4 is disposed on one side of the drum 1 (the stepped portion 1a side in FIG. 1). It separates it from the surface and stops its rotation.

In the same figure, the support plate 11 is fixed to a side plate (not shown), and a solenoid 12 is fixed to the back surface of the support plate 11, which together with a pin 13 and a two-arm member 33, which will be described later, constitutes advancing means for the rotating member 28. A pin 13 fixed to the free end of the operating rod 12a passes through a long hole 11a formed in the side plate 11 and extends toward the front. This pin 13 is oriented so as to be pressed against the left end of the elongated hole 11a by the elasticity of a pin 14 fixed to the support plate 11 and a tension spring 15 whose ends are respectively locked to the pin 13. The locking member 16, whose free end 16a is in pressure contact with the pin 13, is pivotally connected to the support plate 11 by a shaft 17, and is supported by the elastic force of a spring (not shown). Therefore, a clockwise rotational habit is given in the figure. The bases of actuating members 19 and 21 (refer to FIG. 1 for reference numeral 21) are fixed to each end of the shaft 18, which is pivotally connected to the support plate 11 and the immovable member paired therewith. b
Both operating members 19 and 21 include a pin 22 that is fixed to the support plate 11 at one end and a pin 2 that is fixed to the operating member 19 at the other end.
The resiliency of the tensioning springs 24, each of which is latched at 3, provides a counterclockwise rotational behavior in FIG. By pressing the bent piece 19a provided at the free end of the actuating member 19 against one edge of the locking member 16, the actuating members 19, 2 are moved by the elastic force of the spring Z4.
1 is prevented from rotating. In FIG. 4, the eccentric inner edge 3b provided on the upper and lower members 3 is rotated in a direction opposite to the rotational direction of the drum 1 as shown in the figure, so as to approach the rotating shaft 26 integral with the drum 1. A stopper 3c is provided at the end thereof, and the other upper and lower members 4 (see FIG. 1) are also provided with a similar eccentric inner edge 4b and a stopper 4c. are formed respectively.
A bent piece 19b serving as an engaging portion is provided at the free end of the actuating member 19, and a pin 27 is provided at the free end of the other actuating member 21. and 4c. As shown in FIG. 4, a rotating member 28 is pivotally connected to the free end of the actuating member 19 by a shaft 29, and one end of the rotating member 28 is fixed to the free end of the member 28, and the other end is locked to the pin 14. The elasticity of the tight spring 31 imparts a counterclockwise rotational habit}V,
The pin 32 fixed on the back side of the member 28 is connected to the upper arm member 33.
By press-contacting one end 33a, the rotation 1 of the rotating member 28 is prevented.
is pressed against the pin 13 by the elasticity of the spring 31.

A pin 36, which is an engagement protrusion that can be engaged with the rotating member 28, is fixed to a disk 35 fixed to the other end of the rotating shaft 26 of the drum 1, and constantly rotates in the two directions of the arrow. This pin 36 acts on the rotating member 28, but the recess 28a formed at the end of the member 28 is normally outside the rotating path of the pin 36 as shown. The clamping action of the rear end portion of the sheet by the device configured as described above will be described below.

When a sheet (not shown) is started to be fed to the circumferential surface of the drum 1, its leading end is gripped by a gripping claw (not shown) provided on the drum 1, and the sheet feeding operation described above is performed. A signal is given to the solenoid 12 by the detection of the . This solenoid 12 operates and the pin 13
As shown in the figure, by moving to the right and rotating the second arm member 33 clockwise, the rotating member 28 rotates the second arm member 33.
3, the end 28a
advances into the rotation path of the pin 36. In this state, the pin 36 rotates and moves into the recess 28 as shown in FIG.
a, and while pushing up the rotating member 28 in the direction of the arrow 38, the member 28 is rotated clockwise around the shaft 18 as shown in FIG. As a result, the actuating member 19
It rotates clockwise from the position shown in the figure, and at the time of this rotation, after pushing and moving the locking member 16, the bent piece 19a
is the stepped portion 1 provided on the locking member 16 as shown in FIG.
6b. After the pin 36 is separated from the recess 28a of the member 28, the rotation member 28 returns to rotation in the counterclockwise direction due to the elasticity of the spring 31, and the pin 32 returns to the end 33a of the second arm member 33. It stops at the position where it collides with. By the way, when the actuating member 19 is held in the position shown in FIG. Similarly, the pin 27 of the other actuating member 21, which is located within the rotation path of the inner edge 3b of the member 3 and is substantially integral with the bent piece 19b, is also located within the rotation path of the side edge 4b of the upper and lower members 4. It's within.

In this state, when the upper and lower members 3 rotate due to the rotation of the drum 1, the inner edge 3b slides on the bent piece 19b, and the side edge 3b is moved against the rotating shaft 26. Since they are in an eccentric state, the upper and lower members 3 gradually move away from the circumferential surface of the drum. That is, the pressing plate 5 (the first
(see figure) becomes separated from the drum circumference. At the same time, each of the stoppers 3c and 4c of the sub-soil members 3 and 4 abuts against the bent piece 196 and the pin 27 of each actuating member, thereby rotating both parts 3 and 4 and the pressing plate 5. The movement is blocked, and only the drum 1 continues to rotate. The operation of each mechanism is performed immediately after the solenoid 12 is activated, and the pressing plate 5
The drum is separated from the circumferential surface and rotation is stopped.
In this state, the sheet whose leading end is attached to the circumferential surface of the drum passes under the pressing plate 5 as the drum 1 rotates.
When the rear end approaches the waiting pressing plate 5, the pin 36 of the rotating plate 35 collides with the recess 28a of the rotating member 28, as shown in FIG. Lift it up slightly.

On the other hand, the solenoid 12 is designed to be released after advancing the operating members 19 and 21 to the operating position, and the pin 13 of the operating rod 12a attempts to return to its original position due to the elasticity of the spring 15. , as shown in FIG.
Its return movement is prevented by the free end 16a of. When the actuating member 19 is lifted slightly as described above and the pressure contact between the bent piece 19a and the step portion 16b of the locking member 16 is released, the pin 13 of the actuating rod 12a is moved against the locking member. 16 and returns to the original position shown in FIG. 4. That is, when the locking member 16 rotates counterclockwise from the position shown in FIG. to release both sub-soil members 3 and 4. As a result, by the elasticity of the rings 6 and 7, the subgrade members 3 and 4 and the pressing plate 5 are again pressed against the circumferential surface of the drum 1 via the rear end of the sheet, and together with the drum 1, in the direction of the arrow 2. The clamping action of the pressing plate 5 on the rear end of the sheet is completed. According to the present invention, the eccentricity of the pair of upper and lower members for vertically moving and stopping the pressing plate for the rear end of the sheet in a direction opposite to the rotating direction of the drum and approaching the rotating shaft of the drum is provided. By forming the shaped side edges, the operations of separating the stopper members from the drum circumferential surface and stopping them are always performed at the same time, which prevents twisting of the pressing plate and sheet rearing that occur when the above operation fails. It is possible to reliably prevent clamping errors at the ends.

In addition, when releasing the sheet rear end clamp and separating the upper and lower knob members from the drum circumferential surface, this separation action for the subsurface member is achieved by the configuration used for the seat clamp, so special measures are required for releasing the sheet. Since no structure is required, it can be simplified by using both the clamping hole at the rear end of the seat and the structure for releasing the clamp.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a drum unit and a sheet rear end clamp member, FIG. 2 is a perspective view of a pressing plate and a ring fitted to the drum end, and FIG. 3 is a partial cross-sectional view of the drum end. Fourth
The figure is a front view of a sheet rear end clamping device showing one embodiment of the present invention, and FIGS. 5 to 7 are operational views of the device. 1... Drum, 3, 4... Upper and lower members, 3b, 4b.
...Inner edge, 3c, 4c...Stopper 1, 5...Press plate, 12...Solenoid, 13, 33...Advancing means for rotating member 28, 16...Locking member, 19・
...Operating member, 19b...Engaging portion, 28...Rotating member, 28a...End portion, 29...Axle serving as the center of rotation of rotating member 28, 36...Engagement protrusion.

Claims (1)

[Claims] 1. Provided at both ends of the circumferential surface of the drum on which the sheet is to be wound, and provided on the eccentric inner edge facing toward the rotational axis of the drum and the rear end thereof, in the opposite direction to the rotational direction of the drum. The drum has a pair of upper and lower members that rotate together with the drum, and both ends are fixed to the upper and lower members and are close to the circumferential surface of the drum along the generatrix of the drum. A pressing plate for pressing the trailing edge of the sheet, an engaging protrusion that rotates integrally with the drum at least at one end of the drum, and an engaging protrusion that is arranged so as to be movable forward and backward with respect to a rotation path of the engaging protrusion. Then, the rotary member whose end part is retracted outward from the rotary path of the engaging protrusion is engaged with the end part of the rotary member, and the end part is engaged with the rotary member. A advancing means including a solenoid for advancing into the rotation passage of the protrusion is pivotally connected to the rotation center of the rotation member, and the free end portion is normally located outside the rotation passage of the inner edge of the upper and lower members. , by the advancing means, the rotating member advances into the rotating passage of the engaging protrusion, is pushed around by the engaging protrusion via the rotating member, and causes the free end to rotate on the inner edge. Positioned in the movement path, the engaging portion of the free end pushes up the upper and lower members away from the drum peripheral surface, and the engaging portion collides with the stopper of the upper and lower members to rotate the upper and lower members. an actuating member for stopping the actuating member; and an actuating member that is freely engageable and detachable from a free end of the actuating member, and that engages with the free end when the actuating member is pushed around by the rotating member. It consists of a locking member that holds the actuating member in that position, and when the rotating member is advanced into the rotation path of the engaging protrusion that rotates with the drum, the rotating member and the engaging protrusion are connected to each other. By causing the upper and lower members to be pushed up in conjunction with the engagement, and by releasing the solenoid when the rear end of the sheet on the drum is positioned between the pressing plate and the drum circumferential surface. . A sheet trailing end clamp device, characterized in that the holding of the operating member is released and the pressing plate is brought into pressure contact with the drum via the trailing end of the sheet.