JPS6111790B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for clamping the leading and trailing ends of a sheet wound around the peripheral surface of a drum.

In Tensha FAX, the original plate for Tensha is created by wrapping the base paper (sheet) around a drum and rotating it in synchronization with other manuscripts, forming a manuscript image on the base paper by electric discharge destruction. . Unlike ordinary facsimile sheets, this base paper has a large and thick gripping allowance at the leading end, and therefore the gripper that holds the leading end must move a large amount.

SUMMARY OF THE INVENTION An object of the present invention is to provide a seat clamp device that satisfies the above-mentioned needs.

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

In FIG. 1, a cam 4 is attached to the shaft 3 of a drum 2 that is rotatable in the direction of the arrow 1, and a rotating member 5 that is substantially integral with the cam 4 rotates around the drum 2 as shown in FIG. It is provided on one side of 2 and can be rotated manually. The cam 4 is given reverse rotation by the elasticity of a bistable spring 6 whose one end is locked to the drum, and a cutout 4a provided at the peripheral edge of the cam 4 has a third As shown in the figure, one step of the notch 7a formed in the stopper 7 is in pressure contact. The stopper 7 is slidably held by a guide member (not shown) within the drum 2, and is pulled to the left by the elasticity of a spring 8 whose one end is locked to a stationary member. As the cam 4 rotates, the tip of the stopper 7 fits into the hole in the side plate 9, and the switch 11 is activated, thereby restricting the rotation of the drum 2 and preventing the user from accidentally turning on the start switch. The drum is also prevented from rotating by the action of the switch 11.

A pin 13 fixed to a gripper 12 is inserted into a grooved cam 4b provided on the cam 4, and the base of the gripper 12 is pivotally connected to the drum 2 by a shaft 14. At the free end of the gripper 12,
A holding member 15 consisting of a pair of leaf springs is provided, between which the thick portion at the leading end of the sheet is inserted and held. In FIG. 4, the trochanter 16 that is in pressure contact with one end 4c of the cam 4 is mounted on an arm 17a of a clamp member 17, and the clamp member 17 is pivoted to the drum 2 by a shaft 18. The rotational behavior in the clockwise direction is provided by the elasticity of a tension spring 19, which is attached at one end to the drum 2. The clamp member 17 is in pressure contact with a stepped portion provided on the circumferential surface of the drum 2, and a holding member 21 is attached to a bent piece 17b provided at the free end of the arm 17a.
The one arm end 21a of is in pressure contact. The retaining member 21 is pivotally connected to the drum 2 by a shaft 22 and is given a clockwise rotational habit by a tension spring 23 which is locked at one end to the drum 2. A support member 25 having a straining member 24 mounted on its free end is attached to a stationary member by a shaft 26, and the support member 25
A bent portion 28a of a locking member 28, which is pivotally connected to the immovable member by a shaft 27, is locked to the stepped portion 25a provided in the support member 25, thereby restraining the support member 25.

Now turn the rotating member 5 manually to move the cam 4 to the first position.
When the gripper 12 is rotated clockwise in the figure, the gripper 12 is rotated counterclockwise as indicated by the chain line 1.
When the holding member 15 reaches the position 2A, the holding member 15 advances to the vicinity of the drum circumferential surface. In this state, the leading end of the sheet is press-fitted into the holding section 15 and held there. By inverting the cam 4 and returning it to its original position, the holding section 15 largely draws the leading end of the sheet into the drum. The rotation of the cam 4 pushes the trochanter 16 around and opens the clamp member 17 as shown in FIG. When the clamp member 17 is rotated, the pin 29 fixed thereto rotates the locking member 28 clockwise, so that the support member 25 is released from the locking member 28 and the squeezing member 24 is pressed against the drum circumferential surface. do. The clamp member 17 is held in an open state by the bent pieces 17b coming into pressure contact with the corners of the holding member 21, as shown in FIG. When the drum 2 is rotated in the direction of the arrow 1 in this state, the sheet is squeezed by the squeezing member 24 while being wrapped around the circumferential surface of the drum. When the drum 2 rotates once, the rear end of the sheet is in an open state with the clamp member 17
will be inserted below. The holding member 21 rotated once again.
When the other arm end 21b collides with the beating rod 31 fixed to the immovable member and rotates counterclockwise, the clamp member 17 rotates clockwise to close and close the sheet. Clamp the rear end.

FIG. 5 is a view of the apparatus shown in FIG. 4 from the opposite side, and an arm member 33 pivotally attached to the side of the support member 25 by a shaft 32 has one end attached to the support member 33 and the other end supported by the arm member 33. The member 25 is pressed against the pin 34 by the elasticity of a spring 35 that is engaged with the pin 34 . Clamp member 1 that clamps the rear end of the seat
7 further rotates, and the pin 36 fixed to the arm 17c fits into the recess formed in the free end of the arm member 33 and lifts the support member, so that the support member 25 is locked again. The squeezing member 24 is locked by the member 28 and separated from the circumferential surface of the drum.

According to the present invention, a sheet having a large gripping allowance at the leading end of the sheet can be reliably clamped by rotating the clipper holding section largely following the rotation of the cam.

[Brief explanation of drawings]

FIG. 1 is a front view of a sheet clamping device showing one embodiment of the present invention, FIG. 2 is a front view of a drum, and FIG.
The figure is a front view of the stopper, Figure 4 is a front view of the seat rear end clamp section, Figure 5 is a view of the device in Figure 4 seen from the opposite side, and Figure 6 is an operational view of the device in Figure 4. be. 2...Drum, 4...Cam, 12...Gripper, 15...Holding section, 17...Clamp member.

Claims (1)

[Claims] 1. A cam that is installed inside the drum for sheet mounting and rotates by manually rotating a rotating member provided at one end of the drum, and a cam that follows the rotation of this cam. and a gripper that moves the holding part that holds the leading edge of the sheet to a sheet gripping position near the drum circumference and a retracted position inside the drum, and a gripper that moves the holding part that grips the leading edge of the sheet to a sheet gripping position near the drum circumference and a retracted position inside the drum, and a gripper that moves the holding part that grips the leading edge of the sheet to the sheet gripping position and the retracted position inside the drum, and a gripper that moves the holding part that grips the leading edge of the sheet, and a gripper that moves the holding part that grips the leading edge of the sheet to a sheet gripping position near the drum circumference and a retracted position inside the drum, and a gripper that moves the holding part that grips the leading edge of the sheet to the sheet gripping position and the retracted position inside the drum. a clamping member for the end; a means for closing the clamping member after the first rotation of the drum to clamp the rear end of the sheet; and a member for squeezing the sheet by coming into contact with and separating from the peripheral surface of the drum during sheet winding. Seat clamp device.