JPH0630390Y2 - Swing-type roll paper cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is used in a roll paper cutter device, in particular, in a copying machine, a facsimile machine or the like, and is used for rewinding roll paper or the like to cut it into a predetermined length. A dynamic roll paper cutter device.

[Conventional technology]

This type of roll paper cutter device is shown in FIG. 3 and FIG.
As shown in the figure, both ends of the swing blade 1 are both side plates (not shown).
Is rotatably attached to the support shafts 3 and 3, and the blade edge of the swing blade 1 and the blade edge of the fixed blade 2 are inclined.
Further, the fixed blade 2 is rotatably provided on both side plates (not shown) by the support shafts 4 and 4 at both ends thereof, and the force of a spring 10 acting on the fixed blade 2 causes the fixed blade 2 to swing with respect to the cutting edge of the fixed blade 2. Tolerance pressure contact is made with the cutting edge of the blade 1. On the other hand, the blade edge of the swing blade 1 and the fixed blade 2
A guide ring 11 is provided at the end of the rocking blade 1 on the cutting start side so as to smoothly mesh with the cutting edge of the rocking blade. Further, as another means for smoothly engaging the blade edge of the oscillating blade 1 with the blade edge of the fixed blade 2, a fourth
As shown in the figure, there is a fixed blade 2 provided with a cutting edge guide plate 12 protruding from the cutting edge at the end on the cutting start side. When the swinging blade 1 is rotationally moved in the cutting direction by a driving unit (not shown), the roll paper 13 placed between the swinging blade 1 and the fixed blade 2 is cut.

[Problems to be solved by the device]

In the above-described conventional rocking type roll paper cutter device, even when the rocking blade 1 completes the cutting of the roll paper 13 and returns to the cutting standby position, the cutting edge of the rocking blade 1 and the cutting edge of the fixed blade 2 are also returned. Since it returns while cross-pressing, the wear of the cutting edge was great and the life of the cutting tool was shortened. Further, the swinging blade 1 is returned to the standby position against the force of the cross pressure contact, which requires a wasteful torque force.

[Means for Solving the Problems]

The present invention is an oscillating roll paper cutter device comprising a fixed blade and a oscillating blade integrally fixed to a cutting start side end portion of a fixed blade guide for guiding the cutting start side cutting edge of the fixed blade. At the side surface of the fixed blade guide fixed to the swing blade and inside the fixed blade guide surface, at a position separated by a predetermined distance from the axis of the support shaft of the swing blade. A cam moving pin is provided parallel to the support shaft of the rocking blade, and the side of the fixed blade guide fixed to the rocking blade is adjacent to the rocking blade. The outer peripheral surface of the oscillating blade on the cutting movement direction side is lower than the height of the fixed blade guide surface of the fixed blade guide, and the outer peripheral surface of the oscillating blade on the return movement direction side is higher than the fixed blade guide surface of the fixed blade guide. The outer peripheral surface on the cutting movement direction side and the outer peripheral surface on the return movement direction side slide without a step. It has a curved outer peripheral surface that is connected to the center of the swing hole, and the radius is centered on the shaft center of the mounting hole inside the outer peripheral surface, and its radius is the shaft center of the supporting shaft of the rocking blade and the cam moving pin. The cam, which has a slot hole centered on a circular arc approximately the same as the distance from the shaft center, is loosely fitted in the slot hole of the cam and the cam moving pin on the side surface of the swing blade, and the outer circumference of the cam The surface of the cam is arranged so that the surface can be brought into contact with the cutting edge of the fixed blade in a corresponding manner, and the operation of the following (a), (b), (c), (d), and (e) is performed in this order. The configuration is such that the shape, the length of the slot hole of the cam, and the mounting position of the cam moving pin are determined. (A) A spring that acts on the fixed blade when the swinging blade is in the cutting standby state. The fixed blade guide surface of the fixed blade guide of the swinging blade and the blade tip of the fixed blade are pressed against each other by the force of the The weight of the cam causes it to be hung on the cam moving pin at the upper end of the cam slot hole. (B) The oscillating blade starts rotating for cutting, and at the same time, the cam moves with the oscillating blade. The cutting edge is rotated in the cutting movement direction, and after the cutting of the roll paper is completed, the blade edge of the fixed blade is smoothly pushed up to the outer peripheral surface of the cam in the return movement direction, and the blade edge of the fixed blade swings. When the blade is separated from the blade tip, the outer peripheral surface of the cam on the return movement side and the blade tip of the fixed blade are brought into a pressure contact state by the force of the spring acting on the fixed blade. The cam moving pin, which moves with the rocking blade when it starts to rotate, moves in the slot hole of the cam until it exceeds the range where the fixed blade edge and the rocking blade edge correspond to each other. Is not moved rotationally, so the cam The outer peripheral surface on the return movement direction side and the blade edge of the fixed blade maintain a pressure contact state by the force of the spring acting on the fixed blade, and the blade edge of the fixed blade and the blade edge of the swinging blade are kept separated from each other. When the blade further rotates in the return movement direction, the cam moving pin that moves together with the swing blade hits the lower end of the slot hole of the cam, the cam is rotated in the return movement direction, and (e) the swing blade further returns. When the cam is rotated in the same direction, the outer peripheral surface of the cam in the return movement direction is smoothly removed from the cutting edge of the fixed blade, and at the same time, the cam moves downward by its own weight until the upper end of the slot slot of the cam hits the cam moving pin In addition, the fixed blade guide surface of the fixed blade guide of the oscillating blade and the blade tip of the fixed blade are brought into a pressure contact state by the force of the spring acting on the fixed blade.

[Action]

The present invention provides a fixed blade, a fixed blade edge, a swing blade, a swing blade edge, a fixed blade guide surface of a fixed blade guide fixed to the swing blade,
The cam, the outer peripheral surface of the cam, the slot hole of the cam, the cam moving pin, and the like are respectively described above in (a), (b), and (c).
(D) In order to operate in the order of (e), the shape of the outer peripheral surface of the cam, the length of the slot hole of the cam, and the mounting position of the cam moving pin are determined. During the return stroke in which the paper is completely cut and returned to the cutting standby position, the blade edge of the fixed blade is separated from the blade edge of the oscillating blade, so the blade edge of the fixed blade and the blade edge of the oscillating blade intersect. It is possible to return to the cutting standby position without pressing. As a result, wear of the blade edges of the fixed blade and the blade edges of the swing blade is reduced, and the life of the blade can be significantly extended. Further, it is not necessary to use a wasteful torque force to return the swing blade to the standby position against the force of the cross pressure contact with the fixed blade.

〔Example〕

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is an explanatory view showing its operation.

In FIG. 1, 1 is a swinging blade, 2 is a fixed blade, and the blade of the fixed blade 2 is the swinging blade 1 by the force of a spring (not shown).
It receives a force in the direction of pressing against the blade edge. 5 is a swinging blade 1
Is a fixed blade guide integrally fixed to the cutting start side end portion, and the outer peripheral surface of the fixed blade guide 5 is a fixed blade guide surface 5a for guiding the cutting edge of the fixed blade 2 on the cutting start side.
On the side surface of the fixed blade guide 5, a cam moving pin 9 is provided inside the fixed blade guide surface at a predetermined distance from the axis of the support shaft 4 of the swing blade 1. 6 is a cam which is adjacent to the fixed blade guide 5 of the rocking blade 1 and is rotatably mounted on the support shaft 4 of the rocking blade 1 by a mounting hole 7. The outer peripheral surface of the cam 6 cuts the rocking blade 1. The outer peripheral surface 6b on the moving direction side is lower than the height of the fixed blade guide surface 5a of the fixed blade guide 5, and the outer peripheral surface 6c of the swing blade 1 on the return moving direction side is lower than the height of the fixed blade guide surface 5a of the fixed blade guide 5. The height is higher, and the outer peripheral surface 6b on the cutting movement direction side and the outer peripheral surface 6c on the return movement direction side have a curved shape smoothly connected without a step. Further, inside the outer peripheral surfaces 6b and 6c of the cam 6, the radius is centered on the axis of the mounting hole 7 of the cam 6, and the radius of the axis of the support shaft 4 of the rocking blade 1 and the axis of the cam moving pin 9 are set. A slot hole 8 having an arc with a radius substantially the same as the distance from the center is provided. The cam 6 is provided with a slot hole 8 provided in the cam 6.
A cam moving pin 9 is passed through the slot hole 8 so that rotation is restricted by both ends of the.

On the other hand, the outer peripheral surfaces 6b and 6c of the cam and the cutting edge of the fixed blade 2 can be brought into contact with each other.

Next, the operation of the device according to the present invention will be described with reference to FIG.

FIG. 2A is a view showing a state in which the swing blade 1 is in the cutting standby position, and the fixed blade guide surface of the fixed blade guide 5 of the swing blade 1 by the force of the spring 10 acting on the fixed blade 2. 5a and the cutting edge of the fixed blade 2 are in pressure contact with each other, and the cam 6 is suspended by the cam moving pin at the upper end of the slot hole 8 by its own weight.

FIG. 2B is a diagram showing a state after the swing blade 1 completes the cutting of the roll paper by the cross pressure contact with the fixed blade 2.
First, a cam moving pin 9 that moves together with the oscillating blade 1 when the oscillating blade 1 is rotated by a driving device (not shown) for cutting and the oscillating blade 1 starts to rotate in the cutting movement direction.
As a result, the cam 6 is simultaneously rotated in the cutting movement direction.
The roll paper or the like is cut by cross pressure contact between the blade edge of the fixed blade 2 and the blade edge of the swing blade 1. After the cutting is completed, the blade tip of the fixed blade 2 is formed such that the height of the outer peripheral surface 6c of the cam 6 on the return movement direction side is higher than the height of the fixed blade guide surface 5a of the fixed blade guide 5. 6c pushes up from the fixed blade guide surface 5a of the fixed blade guide 5, the blade edge of the fixed blade 2 is separated from the blade edge of the rocking blade 1, and at the same time, the outer peripheral surface of the fixed blade 1 and the cam 6 in the return movement direction side. 6c and the fixed blade 1 are cut by the force of the spring 10 acting on the fixed blade 1.

FIG. 2C is a diagram showing the state of the first stage of the stroke in which the swing blade 1 is rotationally moved in the return movement direction. A rotational movement for returning is given to the rocking blade 1 by a driving device (not shown), and even if the rocking blade 1 starts the rotational movement in the returning movement direction, the outer peripheral surface 6c of the cam 6 on the returning movement direction side is formed. The blade tip of the fixed blade 2 is in pressure contact with the force of the spring 10 acting on the fixed blade 2 and the cam 6 does not rotate downward due to its own weight. 9
Only the length of the slot hole 8 can move in the slot hole 8 without being involved with the cam 6, and the edge of the fixed blade 2 and the edge of the rocking blade 1 are separated from each other during this time. The separated state is maintained until the blade edge of the fixed blade 2 and the blade edge of the oscillating blade 1 correspond to each other and exceed a range in which they can cross-contact each other.

FIG. 2D is a diagram showing the state of the second stage of the stroke in which the swing blade 1 is rotationally moved in the return movement direction. After the oscillating blade 1 exceeds the range in which the blade edge of the fixed blade 2 and the blade edge of the oscillating blade 1 can cross-contact with each other in a corresponding manner, the cam moving pin 9 moving together with the oscillating blade 1 is the cam 6 It hits the lower end of the slot hole 8, and at the same time, the cam 6 starts to rotate in the return movement direction.

FIG. 2E is a diagram showing the state of the third stage of the rotational movement stroke of the swing blade 1 in the return movement direction. The cam 6 rotated in the return movement direction by the cam movement pin 9 is fixed to the fixed blade 2
While the blade tip of the fixed blade 2 and the outer peripheral surface 6c of the cam 6 on the return movement direction side are in contact with each other, the force of the spring 10 acting on the fixed blade 2 causes the blade tip of the fixed blade 2 and the return movement direction side of the cam 6 to move. Since the outer peripheral surface 6c is in pressure contact with the outer peripheral surface 6c, the outer peripheral surface 6c does not rotate downward due to its own weight, but the cam 6 moves the cam moving pin 9
Is further rotated in the return movement direction, the outer peripheral surface 6c of the cam 6 on the return movement direction side is disengaged from the cutting edge of the fixed blade 2, and the height of the outer peripheral surface of the cam 6 is the height of the fixed blade guide 5 of the swing blade 1. The outer peripheral surface of the cam 6 is released from the pressure contact state with the blade tip of the fixed blade at the same height as the above, and at the same time, the fixed blade guide surface 5a of the fixed blade guide 5 of the swing blade 1 and the blade tip of the fixed blade 2 are released. Is pressed. Then, the cam 6 released from the pressure contact state with the blade edge of the fixed blade 2 rotates downward until the upper end of the slot hole 8 of the cam 6 hits the cam moving pin 9 by its own weight, and enters the cutting standby state and becomes the next cutting. Prepare for

[Effect of device]

According to the present invention, after the cutting of the roll paper or the like is completed by the cross pressure contact between the blade edge of the fixed blade and the blade edge of the rocking blade, the rocking blade returns to the cutting standby position in the return stroke direction of the cam. Due to the outer peripheral surface of the fixed blade, the blade edge of the fixed blade is separated from the blade edge of the swing blade, and the blade tip of the fixed blade can return to the cutting standby position without pressure contact with the blade edge of the swing blade. The wear of the cutting edges of the fixed blade and the swing blade is reduced, and as a result, the life of the blade can be remarkably extended. Further, it is not necessary to apply useless torque force in the return stroke, and its utility value is remarkable for a copying machine or a facsimile machine which is required to have durability.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, a fixed blade is partially broken, FIG. 2 is an explanatory view showing its operation, and FIGS. 3 and 4 are It is a perspective view showing the conventional rocking type roll paper cutter device. 1 ... Swing blade, 2 ... Fixed blade 3, 4 ... Support shaft, 5 ... Fixed blade guide, 6 ... Cam, 7 ... Mounting hole, 8 ... Slot hole, 9 ... For cam movement Pin, 10 ... Spring, 11 ... Guide ring, 12 ... Blade guide plate, 13 ... Roll paper,

Claims (1)

[Scope of utility model registration request] 1. A swinging blade and a fixed blade, which are rotatably attached by support shafts at both ends, are constituted so that their blade edges are in cross-pressure contact with each other by the force of a spring acting on the fixed blade, and A rocking roll paper in which a fixed blade guide having a fixed blade guide surface for guiding the cutting start side cutting edge of the fixed blade is integrally fixed to the rocking blade at the cutting start side end of the rocking blade. In the cutter device, on the side surface of the fixed blade guide fixed to the swing blade, and inside the fixed blade guide surface, at a position spaced a predetermined distance from the axis of the support shaft of the swing blade, A cam moving pin is provided in parallel with the support shaft of the rocking blade, and a side surface of the fixed blade guide fixed to the rocking blade is adjacent to the rocking blade, and a mounting hole for the rocking blade support shaft is provided. Is loosely fitted by the blade, and the outer peripheral surface of the swing blade on the cutting movement direction side is fixed blade guide. Is lower than the height of the fixed blade guide surface, the outer peripheral surface of the swinging blade in the return movement direction is higher than the height of the fixed blade guide surface of the fixed blade guide, the outer peripheral surface of the cutting movement direction and the outer periphery of the return movement direction side. It has a curved outer peripheral surface that is smoothly connected to the surface without a step, and the inside of the outer peripheral surface is centered on the axial center of the mounting hole, and its radius is the axis of the supporting shaft of the rocking blade. The slot hole of the cam and the cam moving pin on the side surface of the rocking blade are loosely fitted to a cam provided with a slot hole having an arc whose center is substantially the same as the distance between the core and the shaft center of the cam moving pin. Also, arrange the outer peripheral surface of the cam at a position where it can come into contact with the cutting edge of the fixed blade in correspondence with each other, and operate in the order of (a), (b), (c), (d), and (e). The shape of the outer peripheral surface of the cam, the length of the slot hole of the cam, and the mounting of the cam moving pin. (A) When the swing blade is in the cutting standby state, the force of the spring acting on the fixed blade and the fixed blade guide surface of the fixed blade guide of the swing blade and the fixed blade. The blade edge of the cam is in pressure contact, and the cam is suspended by the cam moving pin at the upper end of the slot hole of the cam due to the weight of the cam. (B) At the same time, the swinging blade starts rotational movement for cutting. The cam is rotated and moved in the cutting movement direction by the cam moving pin that moves together with the swinging blade, and the blade edge of the fixed blade is smooth on the outer peripheral surface of the cam in the return movement direction after the cutting of roll paper is completed. Is pushed up to separate the blade edge of the fixed blade from the blade edge of the oscillating blade, and the outer peripheral surface of the cam on the return movement direction side and the blade edge of the fixed blade are brought into pressure contact with each other by the force of the spring acting on the fixed blade. C) Rotational movement of the swinging blade to return The cam moving pin that moves with the swinging blade moves in the slot hole of the cam until the blade tip of the fixed blade and the blade tip of the swinging blade pass the corresponding range, and the cam rotates. Since it is not moved, the outer peripheral surface of the cam on the return movement side and the blade edge of the fixed blade maintain a pressure contact state by the force of the spring acting on the fixed blade, and the blade edge of the fixed blade and the blade edge of the swing blade are maintained. (D) When the swing blade further rotates in the return movement direction, the cam moving pin that moves together with the swing blade hits the lower end of the slot hole of the cam, and the cam is rotated in the return movement direction. (E) When the oscillating blade further rotates in the return movement direction, the outer peripheral surface of the cam in the return movement direction is smoothly removed from the blade edge of the fixed blade, and at the same time, the cam moves the upper end of the slot hole of the cam by its own weight. Rotate downward until it hits the pin At the same time, the fixed blade guide surface of the fixed blade guide of the swing blade and the blade tip of the fixed blade are brought into pressure contact with each other by the force of the spring acting on the fixed blade. apparatus.