JP2019126847A - Cutting device and image forming apparatus provided with the same - Google Patents

Abstract

To provide a cutting device which may ensure an appropriate level of meshing even for thick and strong cutting objects.SOLUTION: A cutter unit 25 of the cutting device has a configuration where a holder holds a fixed round blade 21 as one blade fixed, a movable round blade 22 as the other blade movable, and an elastic member 23, such as a spring, that urges the movable round blade 22 toward movable direction during cutting. In the cutter unit 25, a sheet member as a cutting object is cut between the fixed round blade 21 and the movable round blade 22 that mesh with each other. The movement of the elastic member 23a is regulated by a guide part 24, and has a function that the level of meshing of the fixed round blade 21 and the movable round blade 22 is increased due to compression repulsive force from the sheet member in the direction opposite to the movable direction along with increment in load on the sheet member.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a cutting apparatus and an image forming apparatus provided with the same.

  Conventionally, as this type of cutting apparatus, there is known a type in which a unit (holder) constituted by two round blades is moved along a guide rail by a driving means to cut an object to be cut.

  As an example, there is a “roll paper cutter device” (Patent Document 1) devised so that even a thin roll paper having a low stiffness can be cut straight.

  The technique according to Patent Document 1 described above automatically cuts roll paper by reciprocally sliding a holder provided with a round blade along a guide rail via a driving means.

  However, in such a functional configuration, depending on the type of the object to be cut, some may be thick and stiff, and the blade member of the round blade may become dull and if the load at the time of cutting is increased A force in the direction of separation acts. As a result, the amount of engagement of the cutting edge may be reduced, and the round blade may get over from the engagement, and the cutter device may be damaged.

  The present invention has been made to solve such problems, and its technical problem is to provide a function capable of ensuring an appropriate amount of engagement even for a thick and strong cutting object. .

  In order to solve the above technical problem, one aspect of the present invention includes one fixed round blade, the other movable movable round blade, and an elastic member that urges the movable round blade in a movable direction during cutting. And a cutter unit for cutting the object to be cut between the fixed circular blade and the movable circular blade engaged with each other, and a moving means for moving the cutter unit in a predetermined direction, and the elastic member is a cutting object It is characterized by being a cutting device which increases the amount of meshing of the fixed circular blade and the movable circular blade by receiving a compression repulsive force from the object to be cut opposite to the movable direction as the load of the object increases.

  According to the present invention, it is possible to provide a function capable of ensuring an appropriate amount of engagement even with a thick and firm object to be cut. Problems, configurations, and effects other than those described above will be apparent from the description of the embodiments below.

FIG. 1 is a schematic configuration view showing an ink jet recording apparatus as an example of an image forming apparatus to which a cutting device according to an embodiment of the present invention is applied. It is a schematic block diagram of the cutter unit which is the principal part of the cutting device with which the inkjet type recording device shown in FIG. 1 is equipped. It is a figure which shows the cutter part attachment structure in the cutter unit shown in FIG. 2, (a) is a figure from a side surface direction, (b) is a figure from the front direction which extracted and showed the cutter part. It is the schematic which illustrated the whole structure of the cutting device shown in FIG. It is the top view which extracted and showed the cutter part which is the principal part of the cutting device concerning Example 1. FIG. It is the top view which extracted and showed the cutter part which is the principal part of the cutting device concerning Example 2. FIG.

  Hereinafter, the cutting apparatus of the present invention and an image forming apparatus provided with the same will be described in detail with reference to the drawings by taking several embodiments.

  FIG. 1 is a schematic configuration diagram illustrating an ink jet recording apparatus which is an example of an image forming apparatus to which a cutting apparatus according to an embodiment of the present invention is applied.

  Referring to FIG. 1, the ink jet recording apparatus has a configuration in which an object to be conveyed is supplied from one lower side of the recording apparatus main body 11 to the lower side of the other through the upper side and wound. Examples of the transported object include paper, coated paper, cardboard, OHP, plastic film, prepreg, silver foil, and the like. The following description will be made by taking roll paper as an example.

  More specifically, on one lower side of the recording apparatus main body 11, a roll paper 2 wound around a rotating shaft in a roll shape is held by the paper feed driving unit 1. The roll paper 2 is drawn upward, passes through the paper feed guide plate 3, and is sandwiched between the transport roller 4 and the pinch roller 5. The conveyance roller 4 is a conveyance member that conveys the roll paper 2, and the pinch roller 5 with a pressure release lever 5 a is disposed opposite to the conveyance roller 4 to sandwich the roll paper 2 with the conveyance roller 4. It is. Thereafter, the roll paper 2 passes through the contact portion (nip) between the transport roller 4 and the pinch roller 5 and passes through the platen portion 7.

  At this time, when the roll paper 2 reaches the platen unit 7, an image is formed by ejecting ink onto the roll paper 2 while the print head is scanned by the scanning of the carriage 6 disposed on the platen unit 7. The print head can be a general-purpose example in which ink is ejected and lowered. The roll paper 2 on which the image is formed then passes through the paper discharge guide plate 8 and is taken up by the paper tube 10 held by the paper discharge drive unit 9 on the other lower side of the recording apparatus main body 11. The roll paper 2 on which the image has been formed is appropriately cut by the cutting device 12 at a size set in advance in the direction perpendicular to the conveying direction in the vicinity of the platen unit 7 as necessary. In addition, the place which installs the cutting device 12 is not limited to this, It can change arbitrarily. Moreover, although the roll paper 2 was illustrated as a conveyance target object in which the image was formed here as a cutting | disconnection target object, if it is a sheet | seat member which can be cut | judged with the round blade mentioned later, it is applicable.

  FIG. 2 is a schematic configuration view of a cutter unit 25 which is a main part of the cutting device 12 provided in the above-described ink jet recording apparatus.

  Referring to FIG. 2, the cutter unit 25 has one fixed round blade 21 fixed, the other movable movable round blade 22, and elasticity such as a spring that urges the movable round blade 22 in the movable direction at the time of cutting. The holder 23 is configured to hold the member 23a. The cutter unit 25 cuts a sheet member that is an object to be cut between the fixed round blade 21 and the movable round blade 22 that mesh with each other. The movement of the elastic member 23a is regulated by the guide portion 24, and the fixed round blade 21 and the movable round blade 21 are movable by the elastic restoring force in the direction opposite to the movable direction of the movable round blade 22 as the load of the sheet member increases. It has a function of increasing the meshing amount of the round blade 22. Details of this function will be described later.

  FIG. 3 is a diagram showing a cutter part mounting structure in the above-described cutter unit 25, in which FIG. 3 (a) is a view from the side surface direction, and FIG. 3 (b) is a front view direction extracted and shown. FIG.

  Referring to FIG. 3 (a), the fixed circular blade 21 has the shaft core 21a penetrating at the center, one end of the shaft core 21a is a flange and is attached to the mounting plate 26, and the other end of the shaft core 21a is The shaft support plate 27 is inserted. Also in the movable circular blade 22, the shaft core 22a is penetrated to the center, one end side of the shaft core 22a is a flange portion, and inserted into the oval round insertion hole H of the mounting plate 26 with an elastic member 23b such as a spring interposed. The other end side of the shaft core 22 a is inserted into the shaft support plate 27. The elastic member 23 b urges the movable round blade 22 in the extending direction of the shaft core 22 a and presses the outer peripheral portion thereof against the outer peripheral portion of the fixed round blade 21.

  The elastic member 23a described with reference to FIG. 2 has the axial center 22a in the radial direction, with the space between the flange of the movable circular blade 22 shown in FIG. 3A and the mounting plate 26 as the guide 24. By biasing, the flange portion of the movable round blade 22 is moved in the insertion hole H. Thereby, the meshing amount X of the fixed circular blade 21 and the movable circular blade 22 changes. Referring to FIG. 3 (b), the state in which the meshing amount X changes in the movable range of the insertion hole H in the mounting plate 26 of the movable round blade 22 is shown here. The movable circular blade 22 is connected to the shaft 22a of the motor with the axis of rotation of the motor, and the movable circular blade 22 is configured to rotate.

  FIG. 4 is a schematic view illustrating the overall structure of the cutting device 12 described above. However, the cutter unit 25 here shall accommodate the fixed round blade 21 and the movable round blade 22 in the cutter housing 25a. Further, in the cutter housing 25a, a moving unit 25b that moves the main body of the cutter unit 25 in a predetermined direction (a direction perpendicular to the conveying direction of the sheet member P) is provided as a connecting member.

  Referring to FIG. 4, the cutting device 12 includes a guide member 28 that extends in a direction perpendicular to the transport direction and guides the movement of the moving unit 25 b. The guide member 28 extends in the sheet conveyance width direction, and at least an upper guide rail 31a set longer than the sheet conveyance width, and a lower guide separated from the upper guide rail 31a in the vertical direction below the sheet conveyance path. And a rail 31b. The upper guide rail 31a is disposed below the moving portion 25b, and an upper guide plate is provided above the upper guide rail 31a. The upper guide plate is disposed above the moving unit 25b. In the guide member 28, the forward path of the cutter housing 25a is formed on the upper guide rail 31a, and the return path of the cutter housing 25a is formed on the lower guide rail 31b.

  The driven roller 25d of the cutter housing 25a moves on the upper guide rail 31a in the forward path when the sheet member P is cut, and moves on the lower guide rail 31b in the return path after the sheet member P is cut. Yes. The upper guide rail 31a is a drive roller guide area for guiding the drive roller 25c in the sheet transfer width direction in parallel in the sheet transfer width direction, and a driven roller guide area for guiding the driven roller 25d so that the cutter housing 25a moves in the forward path. And have.

  The cutter housing 25 a is configured to cut the sheet member P by the fixed round blade 21 and the movable round blade 22 in the forward path. In addition, the cutter housing 25a is rotated downward with respect to the moving unit 25b in the return path so that the cutter housing 25a moves to the original position while being retracted from the sheet conveyance path in the sheet thickness direction, that is, in the vertical direction. It has become. The cutter housing 25a is configured to be movable in the sheet conveyance width direction after being cut in the thickness direction of the sheet member P with respect to the sheet conveyance path.

  Therefore, in the return path, the cutter housing 25a is separated from the sheet conveyance path, and the sheet conveyance path is not blocked. Further, when the cutter housing 25a returns from the return path to the forward path, the cutter housing 25a rotates upward with respect to the moving portion 25b. Incidentally, in the cutter housing 25a, a driven roller 25d is provided on the upstream side in the moving direction of the sheet member P at the time of cutting.

  The driven roller 25d is rotatably provided at a position separated from the driving roller 25c in the sheet conveyance width direction. The driven roller 25d moves on the upper guide rail 31a in the forward path of the cutter housing 25a, and moves on the lower guide rail 31b in the return path. Accordingly, the driven roller 25d functions as a member that positions the cutter housing 25a with respect to the upper guide rail 31a and the lower guide rail 31b when the cutter housing 25a moves. The member for positioning the cutter housing 25a is not limited to the driven roller 25d, and may be, for example, an arc-shaped projection.

  The moving unit 25b is provided separately from the cutter housing 25a in the sheet conveyance width direction, and includes a driving roller 25c. Then, it can be moved within a moving region extending in the sheet conveying width direction. The drive roller 25c is made of a rubber roller and is fixed to the rotation shaft so as to be integrally rotatable. Therefore, the drive roller 25c is rotatably held relative to the main body of the cutter housing 25a via the rotation shaft.

  The moving unit 25b is connected to a wire 30 that is stretched between a pair of pulleys 29a and 29b provided on both sides in the sheet conveying width direction. A drive motor M is connected to the pulley 29b. As a result, the wire 30 rotates in the sheet conveying width direction via the pulleys 29a and 29b rotated by the drive motor M. That is, the wire 30 transmits traction force to the moving unit 25b. As a result, the wire 30 can pull the moving unit 25 b in the sheet conveyance width direction. Accordingly, the drive roller 25 c rotationally drives the upper guide rail 31 a in accordance with the rotational movement of the wire 30.

  Further, the cutter housing 25a rotates in the vertical direction around the rotation shaft of the drive roller 25c when switching between the forward path and the return path. As a result, the cutter housing 25a switches between a posture of cutting the sheet member P in the forward path and a posture retracted from the sheet conveyance path in the backward path. Here, the driving roller 25c and the driven roller 25d are arranged so as to be shifted from each other in the sheet conveying width direction, and the driven roller 25d is arranged upstream of the driving roller 25c in the sheet conveying direction. Therefore, the driven roller 25d can be moved between the upper guide rail 31a and the lower guide rail 31b while maintaining the drive roller 25c on the upper guide rail 31a, and the rotation of the cutter housing 25a described above can be performed. Can be realized.

  4 shows a configuration in which the cutter housing 25a is disposed within the width of the carriage 6 in the sheet conveyance width direction. However, the present invention is not limited to this. For example, the cutter housing 25a is upstream of the carriage 6 in the sheet conveyance width direction. It is good also as a structure arrange | positioned in the position spaced apart in the side and downstream. Further, the overall structure of the cutting device 12 is merely an example, and other structures may be applied as long as the sheet member P can be cut in the direction perpendicular to the conveying direction thereof, and therefore, the details are not particularly limited.

  In the following, some specific examples of the cutter unit 25 will be described, regardless of the details of the overall structure of the cutting device 12.

  FIG. 5 is a plan view showing an extracted cutter portion which is a main part of the cutting device (cutter unit 25 ') according to the first embodiment. Referring to FIG. 5, in this cutter portion, the movable round blade 22 that is urged in the urging direction S by the elastic member 23 a as described with reference to FIG. 2 with respect to the fixed round blade 21 moves. It shows one form. A state in which the amount of meshing X at this time changes is denoted as ΔX and is shown in a hatched area. The cutter unit 25 ′ moves in the moving direction V when the sheet member P is cut.

  In this cutter portion, when cutting of the sheet member P is started, the sheet member P accompanied by the urging in the urging direction S of the center O2 ′ of the movable circular blade 22 shown by a solid line with respect to the center O1 of the fixed circular blade 21 And move toward the center O2 side of the movable circular blade 22 shown by a dotted line. This is the fluctuation amount L of the movable round blade 22. At this time, the meshing amount ΔX changes as in the hatched area. The meshing amount ΔX is such that the angle between the center line connecting the center O1 of the fixed circular blade 21 and the center O2 of the movable circular blade 22 and the movable direction (biasing direction S) of the movable circular blade 22 is 90 degrees. Maximum in position.

  That is, the meshing amount ΔX becomes maximum at the position between the center O1 of the fixed round blade 21 in FIG. 5 and the center O2 of the movable round blade 22 indicated by a dotted line. However, when the movable round blade 22 passes this position, the meshing amount ΔX decreases and eventually the meshing is lost. Therefore, in the cutter portion according to one embodiment, the stopper 32a is used as a movable restricting member for restricting the movable range of the movable circular blade 22 without giving a fluctuation amount L in a region beyond the center O2 side of the movable circular blade 22. The movable circular blade 22 is provided so as to be movable to the maximum position of the meshing amount ΔX. Thereby, the actual amount of fluctuation of the movable circular blade 22 is leftward from the intersection line of the line connecting the center O1 of the fixed circular blade 21 in the hatched area in FIG. 5 and the center O2 of the movable circular blade 22 shown by the dotted line. Only part.

  According to the cutter unit 25 'according to the first embodiment, the sheet member P is moved in the moving direction V to cut the sheet member P in the direction perpendicular to the transport direction. At this time, as the load on the sheet member P increases, a compression repulsive force from the sheet member P in the direction opposite to the movable direction of the movable circular blade 22 is applied to the elastic member 23a. In other words, as the load of the sheet member P increases, the elastic member 23a receives a compression repulsive force from the sheet member P in the direction opposite to the movable direction of the movable circular blade 22. Thus, the sheet member P can be cut by increasing the meshing amount ΔX of the fixed round blade 21 and the movable round blade 22. As a result, it is possible to obtain a function capable of securing an appropriate amount of engagement even for a thick and firm object to be cut.

  As a measure to prevent the cutter unit 25 'from being damaged, the load of the meshing amount ΔX of the fixed circular blade 21 and the movable circular blade 22 is monitored by the motor current of the motor coupled to the shaft core 22a of the movable circular blade 22 It is preferable to detect if there is an occurrence of In this case, as a result of monitoring the motor current by the control unit, when a predetermined threshold value is exceeded, the motor is stopped, the cutting of the sheet member P is stopped, the cutter unit 25 'is pulled back, and the occurrence of a jam or the like is displayed. It should be displayed on and notified. Incidentally, the occurrence of a jam or the like may be determined by providing position sensors at the start position and the end position of the cutting of the sheet member P, and the control unit judging from these position sensors the passage of time in the moving direction V.

  FIG. 6 is a plan view showing a cutter part, which is a main part of the cutting device (cutter unit 25 ″) according to the second embodiment. Referring to FIG. 2 shows another mode in which the movable round blade 22 urged in the urging direction S by the elastic member 23a moves as described with reference to FIG. A state in which the meshing amount X changes is represented by ΔX ′ and indicated by a hatched area. The cutter unit 25 ″ moves in the moving direction V when the sheet member P is cut.

  In this cutter portion, the center O2 ′ of the movable round blade 22 indicated by the solid line is supported by the other end side of the support member 33 whose one end side is the rotation center OX. When the cutting of the sheet member P is started, the compression repulsive force from the sheet member P accompanying the urging in the urging direction S of the center O2 ′ of the movable round blade 22 indicated by a solid line with respect to the center O1 of the fixed round blade 21. While moving to the center O2 side of the movable circular blade 22 shown by a dotted line. This is the fluctuation amount L ′ of the movable round blade 22, and at this time, the meshing amount ΔX ′ changes like the hatched area. The meshing amount ΔX ′ is maximized at a line position where the center O2 of the movable round blade 22 reaches the line connecting the rotation center OX and the center O1 of the fixed round blade 21.

  That is, the meshing amount ΔX ′ is maximized at a position on the line connecting the center O2 of the movable round blade 22 indicated by the dotted line in FIG. 6 with the rotation center OX and the center O1 of the fixed round blade 21. However, when the movable round blade 22 passes this position, the meshing amount ΔX ′ decreases and eventually the meshing is lost. Therefore, even in the cutter unit according to another embodiment, a stopper as a movable limiting member that limits the movable range of the movable round blade 22 without having the fluctuation amount L ′ in the region beyond the center O2 side of the movable round blade 22. 32 b is provided to allow the movable circular blade 22 to move to the maximum position of the meshing amount ΔX ′. Thereby, the actual fluctuation amount of the movable round blade 22 is only the left portion from the intersection of the line segment connecting the center O1 of the fixed round blade 21 and the rotation center OX in the hatched region in FIG.

  According to the cutter unit 25 ″ according to the second embodiment, the sheet member P is cut in a direction perpendicular to the conveying direction by moving in the moving direction V. At this time, as the load on the sheet member P increases, the movable circle A compressive repulsion force from the sheet member P in the direction opposite to the movable direction of the blade 22 is applied to the elastic member 23a, in other words, the elastic member 23a moves in the movable direction of the movable round blade 22 as the load on the sheet member P increases. It receives the compression repulsive force from the sheet member P in the opposite direction, thereby increasing the meshing amount ΔX ′ of the fixed circular blade 21 and the movable circular blade 22 and cutting the sheet member P. As a result, it is thick. Even in the case of a strong cutting object, it is possible to obtain a function capable of securing an appropriate meshing amount.

  Also here, as a measure for preventing the cutter unit 25 ′ ′ from being damaged, the load of the meshing amount ΔX ′ of the fixed circular blade 21 and the movable circular blade 22 is monitored for the motor current of the motor coupled to the shaft core 22a of the movable circular blade 22. It is preferable to detect the occurrence of a jam, etc. In this case, as a result of monitoring the motor current by the control unit, when the predetermined threshold is exceeded, the motor is stopped and the cutting of the sheet member P is stopped, and the cutter is cut. The unit 25 ′ ′ may be pulled back and notification of occurrence of jamming or the like may be displayed on a display unit or the like. Incidentally, here again, occurrence of a jam or the like may be determined by providing position sensors at the start position and the end position of cutting of the sheet member P, and the control unit determines from these position sensors by observing the passage of time with respect to the moving direction V. good.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the technical scope thereof, and all the technical matters included in the technical idea described in the claims are included. The subject of the present invention. The above-described embodiments show preferred examples, but those skilled in the art can realize various modifications from the disclosed contents, and these are described in the appended claims. Included in the technical scope.

DESCRIPTION OF SYMBOLS 1 paper feed drive part 2 roll paper 2a rotating shaft 3 paper feed guide plate 4 conveyance roller 5 pinch roller 5a pressure release lever 6 carriage 7 platen part 8 paper discharge guide plate 9 paper discharge drive part 10 paper tube 11 recording apparatus main body 12 cutting Device 21 Fixed round blade 21a, 22a Shaft core 22 Movable round blade 23a, 23b Elastic member 25, 25 ', 25 "Cutter unit 25a Cutter housing 25b Moving part 25c Drive roller 25d Driven roller 26 Mounting plate 27 Shaft support plate 28 Guide member 29a, 29b Pulley 30 Wire 31a Upper guide rail 31b Lower guide rail 32a, 32b Stopper 33 Support member L, L 'Fluctuation amount H Insertion hole OX Rotation center P sheet member

JP 2004-123281 A

Claims (5)

One fixed round blade, the other movable movable round blade, and an elastic member that biases the movable round blade in the movable direction at the time of cutting, and the fixed round blade and the movable round blade that mesh with each other And a moving unit configured to move the cutter unit in a predetermined direction.
The elastic member receives a compressive repulsion force from the cutting object in a direction opposite to the moving direction of the movable round blade as the load of the cutting object increases, so that the fixed round blade and the movable round blade A cutting device characterized by increasing the amount of engagement. In the cutting device according to claim 1,
The cutter unit has a movable restricting member for restricting the movable range of the movable round blade,
A cutting device comprising: a guide member extending in the predetermined direction to guide movement of the moving portion; and a driving member driving the moving portion along the guide portion of the guide member. . In the cutting device according to claim 2,
The meshing amount is maximized at a position where the angle between the center line of the fixed round blade and the center line of the movable round blade and the movable direction of the movable round blade is 90 degrees,
The cutting device characterized in that the movable restricting member is a stopper provided so that the movable circular blade can move to the 90 degrees. In the cutting device according to claim 2,
The center of the movable circular blade is supported by the other end side of the support member whose one end side is the rotation center,
The meshing amount is maximum at a position on a line where the center of the movable circular blade reaches a line connecting the center of rotation and the center of the fixed circular blade,
The cutting apparatus according to claim 1, wherein the movable restricting member is a stopper provided to move the movable circular blade to the position on the line. An image forming apparatus comprising the cutting device according to any one of claims 1 to 4,
The object to be cut is conveyed and subjected to image formation;
The image forming apparatus, wherein the cutting device is configured to cut the image-formed transferred object in a direction perpendicular to the direction of the transfer.