JP4040376B2 - Sheet transport device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet conveying apparatus, and particularly to a sheet conveying apparatus that conveys and discharges a sheet such as a folded drawing, document, or paper from an upstream apparatus downstream.
[0002]
[Prior art]
Drawings folded by the drawing folding machine, documents printed by the printing device, and sheets such as paper are received from these upstream devices by the sheet conveying device when moving to the next work process. , Transported and discharged downstream. FIG. 3 is a side view of the arrangement of each part of a conventional example of a sheet conveying apparatus that receives sheets from the upstream apparatus and conveys and discharges them downstream, and the sheet conveyed with the sheet conveying apparatus. The figure for demonstrating a relationship and a subject is shown to Fig.4 (a)-(c).
[0003]
The sheet conveying apparatus includes a conveying path belt 110 that conveys a sheet 900 such as a drawing or document on the upper surface and conveys the conveying path belt 110 and conveying path rollers 120 and 130 that run the conveying path belt 110 at a constant speed. The upper surface side conveying roller 210 in contact with the upper surface of the conveying path belt 110, the lower surface side conveying roller 220 in contact with the lower surface of the conveying path belt 110, and pressurization that applies a prescribed pressure between the upper surface conveying roller 210 and the lower surface side conveying roller 220. And a conveyance roller pair mechanism 200 that conveys the sheet 900 on the conveyance path belt 110 downstream together with the conveyance path belt 110, and an extended surface of the sheet conveyance path by the conveyance path belt 110 and the conveyance path rollers 120 and 130. Upper surface side discharge rollers arranged in contact with each other at the (downstream, broken line portion) and in proximity to the conveyance path mechanism 100 10 and a lower surface side discharge roller 420 and a pressure spring 433x that applies a predetermined pressure between the upper and lower rollers, and a discharge roller pair mechanism 400x that discharges the sheet 900 sent from the conveyance path mechanism 100 to the downstream side. The peripheral speed of the upper surface side discharge roller 410 and the lower surface side discharge roller 420 of the discharge roller pair mechanism 400x is upstream so that delivery to a downstream device, machine, etc. can be performed reliably. It is necessary to make it faster than the sheet conveyance speed by the conveyance path mechanism 100 and the conveyance roller pair mechanism 200 on the side.
[0004]
[Problems to be solved by the invention]
The conventional sheet conveying apparatus described above has a conveying path mechanism 100 that travels the conveying path belt 110 at a constant speed, pressurizes the conveying path belt 110 from above and below, and moves the sheet downstream with the conveying path belt 110. The conveying roller pair mechanism 200 including the upper surface side conveying roller 210 and the lower surface side conveying roller 220, and the upper surface side discharge roller 410 and the lower surface which are in pressure contact with each other on the extended surface (downstream) of the sheet conveying path by the conveying path belt 110. And a discharge roller pair mechanism 400x that discharges the sheet to the downstream side at a higher speed than the upstream conveyance path mechanism 100 and the conveyance roller pair mechanism 200. The length of the sheet 900, such as a drawing folded by a folding machine, a document printed by a printing device, or a sheet, is the folding form of the drawing or the type of document. As shown in FIG. 4A, the lengths of these sheets 900 are the upper surface side conveying roller 210 and the lower surface side conveying roller 220 of the conveying roller pair mechanism 200, and the upper surface side discharge of the discharging roller pair mechanism 400x. When the length of the sheet 900 is longer than the span between the roller 410 and the lower surface side discharge roller 420, the upper surface side transport roller 210 and the lower surface side transport roller 220 of the transport roller pair mechanism 200 (hereinafter referred to as a transport roller pair). Although the sheet is being conveyed, the sheet may be discharged at a high speed by being added to the upper surface side discharge roller 410 and the lower surface side discharge roller 420 (hereinafter also referred to as a discharge roller pair) of the discharge roller pair mechanism 400x. Therefore, there is a tension between them, and among the sheets 900, the drawing folded by the drawing folding machine is shown in FIG. As shown in c), the folding form of the drawing collapses, and a slip occurs between the roller pair having a lower pressure between the roller pair and the sheet 900, and the slip mark of the roller on the sheet 900 becomes dirty. In addition to the tearing of the sheet, an unpleasant slip noise, and when the sheet comes out of the pair of conveying rollers, the sheet is momentarily released from the tension of both rollers and bends. As a result, there has been a problem that the roller slips out and an abnormal noise occurs.
[0005]
In view of the above-described problems of the prior art, the object of the present invention is such that the sheet conveying and discharging speed of the discharge roller pair is faster than the upstream sheet conveying speed, and the length of the sheet is between the conveying roller pair and the discharging roller pair. Even if the span is longer than the span between the sheet, the folded form of the sheet does not break, the stain of the slip does not adhere to the sheet, and the sheet breaks, an annoying slip noise, abnormal noise coming out of the roller, etc. It is an object of the present invention to provide a sheet conveying apparatus in which no occurrence occurs.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a sheet conveying apparatus according to the present invention is a sheet conveying apparatus that receives a sheet of drawings, documents, and papers from the upstream side of the conveyance, and conveys and discharges the sheet downstream. It is characterized by having.
(B) A conveyance path mechanism including a conveyance path belt and a conveyance path roller that places the sheet on the upper surface and conveys the sheet downstream at a predetermined speed. (B) Located on the upper surface side and the lower surface side of the conveyance path belt. A transport roller pair mechanism including an upper surface side transport roller and a lower surface side transport roller that sandwich the sheet on the transport path belt and transport it downstream with the transport path belt. (C) The upper surface side transport roller and the lower surface side transport A sheet that includes a sensor disposed in the vicinity of the roller, and determines whether the sheet on the conveyance path belt is being conveyed by being sandwiched between the upper surface side conveyance roller and the lower surface side conveyance roller, or whether the sheet has exited from this conveyance state. Conveyance state determination unit (d) An upper surface disposed so as to be close to and away from the upper surface side and the lower surface side of the downstream portion of the sheet conveyance path by the conveyance path mechanism and the conveyance roller pair mechanism. The side discharge roller and the lower surface side discharge roller, and the upper surface side discharge roller and the lower surface side discharge roller are moved in a direction approaching each other based on the contact / separation control signal and are held apart at a set mutual interval. A discharge roller pair mechanism that conveys and discharges the sheet downstream at a faster speed than the conveyance path mechanism and the conveyance roller pair mechanism. (E) A discharge roller that generates the contact / separation control signal, when the determination result of the sheet conveyance state determination unit is sandwiched between conveyance rollers and during separation, and when it is out of the conveyance state, an approach command is generated. Contact / separation control unit
Further, the discharge roller pair mechanism has a movable structure in which one of the upper surface side discharge roller and the lower surface side discharge roller is held at a fixed position, and the other is movable toward and away from the one. The roller interval control / pressurizing unit has a configuration in which the other movable structure discharge roller is moved according to the contact / separation control signal to approach and separate the discharge rollers.
[0008]
In the discharge roller pair mechanism, the upper surface side discharge roller of the upper surface side discharge roller and the lower surface side discharge roller has a movable structure, and the roller interval control / pressure unit includes the upper surface side discharge roller, The roller spacing control / pressurizing unit is held at a fulcrum and can be rotated around the fulcrum, and can be rotated around the fulcrum. A support plate that moves a roller with respect to the lower surface side discharge roller, and a second end side of the support plate that is different from the first end side is moved by the contact / separation control signal, whereby the first A roller interval control means for controlling the approach and separation between the upper surface side discharge roller and the lower surface side discharge roller by the end side, and a pressure spring that applies pressure between the upper surface side discharge roller and the lower surface side discharge roller. ,Also, The roller interval control / roller control means of the pressure unit includes a cam that is rotatable about a fixed central axis and rotates with its outer periphery in contact with the other end side of the support plate. The upper surface side discharge roller and the lower surface side discharge roller are made to approach and separate from each other by the difference in length between the central axis and the outer periphery.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention is a sheet conveying apparatus that receives a sheet of drawings, documents, and papers from the upstream side of the conveyance, and conveys and discharges the sheet downstream, and is predetermined by placing the sheet on the upper surface. A transport path mechanism including a transport path belt and a transport path roller, which is transported downstream at a high speed, and an upper surface side and a lower surface side of the transport path belt. A conveying roller pair mechanism including an upper surface side conveying roller and a lower surface side conveying roller that conveys downstream together with the road belt, and a sensor disposed in proximity to the upper surface side conveying roller and the lower surface side conveying roller. A sheet conveyance state determination unit for determining whether a sheet on the belt is being conveyed by being sandwiched between the upper surface side conveyance roller and the lower surface side conveyance roller, or the conveyance path device; And an upper surface side discharge roller and a lower surface side discharge roller disposed so as to be able to approach and separate from each other on the upper surface side and the lower surface side of the downstream portion of the sheet conveying path by the conveying roller pair mechanism, and these upper surface side discharge roller and lower surface side Roller interval control / pressurization unit that moves the discharge rollers in directions approaching each other based on the contact / separation control signal and holds them apart at a set mutual interval to sandwich the sheet conveyed between them. And a determination result of the discharge roller pair mechanism that transports and discharges the sheet downstream at a faster speed than the transport path mechanism and the transport roller pair mechanism, and the determination result of the sheet transport state determination unit is sandwiched between the transport rollers. A discharge roller contact / separation control unit for generating the contact / separation control signal, which is a separation holding command during conveyance and an approach command when exiting the conveyance state.
[0010]
By adopting such a configuration, even if the sheet conveyance and discharge speed of the discharge roller pair are faster than the upstream sheet conveyance speed and the sheet length is longer than the span between the conveyance roller pair and the discharge roller pair, the sheet Is not added to both the conveying roller pair and the discharge roller pair at the same time, so that the folded form of the drawing (one of the sheets) folded by the drawing folding machine is not broken, and the roller slips on the sheet. It is possible to prevent traces from being stained, and to prevent sheet tearing, annoying slipping noise, roller slipping out abnormal noise, and the like.
[0011]
【Example】
Next, embodiments of the present invention will be described with reference to the drawings.
FIGS. 1A and 1B are side views of an arrangement showing an embodiment of the present invention, and FIGS. 2A to 2D are a sheet conveying device and a sheet for explaining the operation and effect of this embodiment. It is an arrangement | positioning side view which shows these relationships.
In this embodiment, the main configuration includes a conveyance path mechanism 100, a conveyance roller pair mechanism 200, a sheet conveyance state determination unit 300, a discharge roller pair mechanism 400, and a discharge roller contact / separation control unit (not shown). The conveyance path mechanism 100 and the conveyance roller pair mechanism 200 are the same as those in the above-described conventional example, but a sheet conveyance state determination unit 300 and a discharge roller contact / separation control unit are added to the conventional example, and the discharge roller pair The mechanism 400 is different from the conventional discharge roller pair mechanism 400x. Hereinafter, this embodiment will be described with a focus on the added portion and the different portion.
[0012]
First, the sheet conveyance state determination unit 300 is disposed in the vicinity of the upper surface side conveyance roller 210 and the lower surface side conveyance roller 220 of the conveyance roller pair mechanism 200 (hereinafter also referred to as conveyance roller pair (210, 220)). Whether the sheet 900 including the sensor 310 on the conveyance path belt 110 of the conveyance path mechanism 100 is being conveyed by being sandwiched between the upper surface conveyance roller 210 and the lower surface conveyance roller 220 or not is determined. To do.
[0013]
Next, the discharge roller pair mechanism 400 includes a downstream portion (part indicated by a broken line in FIG. 1A) of the sheet conveyance path by the conveyance path mechanism 100 and the conveyance roller pair mechanism 200, and the upper surface side of the sheet conveyance path. The upper surface side discharge roller 410 and the lower surface side discharge roller are arranged on the lower surface side so as to be able to approach and separate from each other, the upper surface side is a movable structure, and the lower surface side is held in a fixed position in contact with the sheet conveyance path. 420 (hereinafter also referred to as a discharge roller pair (410, 420)), the upper surface side discharge roller 410 and the lower surface side discharge roller 420 are moved toward each other based on the contact / separation control signal, and A roller spacing control / pressurizing unit 430 that holds the sheet 900 held between them at a predetermined interval and sandwiches the sheet 900 conveyed between them. The transport 900 is transported and discharged downstream at a faster speed than the transport path mechanism 100 and transport roller pair mechanism 200 on the upstream side (transport and discharge drive sources are not shown). The details of the pressure unit 430 are as follows.
[0014]
That is, the roller interval control / pressurizing unit 430 is held at a fulcrum and is rotatable around the fulcrum, and has a support plate 431 that holds the rotation center axis of the upper discharge roller 410 at one end thereof, and an upper discharge on the upper surface. Connected to the cam 432 of the roller interval control means for contacting and separating the roller 410 and the lower surface side discharge roller 420 and the other end side of the support plate 431, pressure is applied between the upper surface side discharge roller 410 and the lower surface side discharge roller 420. And a pressurizing spring 433. The cam 432 is rotatable around a fixed central axis and rotates on the basis of the contact / separation control signal with its outer periphery contacting the other end of the support plate 431. In addition, the upper surface side discharge roller 410 and the lower surface side discharge roller 420 are brought into contact with and separated from each other due to the difference in length between the central axis and the outer periphery.
[0015]
Note that the discharge roller contact / separation control unit omitted in FIG. 1 has a length dimension in the conveyance direction of the sheet 900 that is a distance between the conveyance roller pair (210, 220) and the discharge roller pair (410, 420). If the determination result of the sheet conveyance state determination unit 300 is longer, the separation holding command is issued when the conveyance is sandwiched between the conveyance rollers, and the approaching / separation control signal of the approach command is issued when the sheet is out of the conveyance state. Generated and supplied to the discharge roller pair mechanism 400.
[0016]
In this embodiment, as shown in FIG. 2A, the length dimension of the sheet 900 in the conveyance direction is longer than the distance between the conveyance roller pair (210, 220) and the discharge roller pair (410, 420). Even in this case, as shown in FIGS. 2B and 2C, while the sheet 900 is being conveyed while being sandwiched between the conveying roller pair (210, 220), there is a gap between the discharging roller pair (410, 420). They are held apart at predetermined intervals. When the sheet 900 comes out of the pair of conveying rollers (210, 220), the pair of discharge rollers (410, 420) approaches to sandwich the sheet 900, and the sheet 900 is moved downstream at a higher speed than the upstream side. And transport and discharge.
[0017]
Therefore, the sheet 900 is not caught by the pair of conveying rollers (210, 220) and the pair of discharging rollers (410, 420) at the same time, and the sheet conveying and discharging speed by the pair of discharging rollers (410, 420) is upstream. Even when the sheet conveyance speed is higher than the sheet conveyance speed on the side, the sheet 900 is not pulled between the conveyance roller pair and the discharge roller pair as in the conventional example, and the folded state of the sheet, especially the drawing, is collapsed. It is possible to eliminate problems such as slip marks on the sheet, tearing of the sheet 900, annoying slip noise, abnormal noise coming out of the roller, and the like.
[0018]
In this embodiment, the roller interval control / pressurizing unit includes a support plate 431, a cam 432, and a pressure spring 433. However, a member other than the cam is used between the discharge roller pair (410, 420). May be controlled, or the upper discharge roller 410 may be moved directly by a plunger or the like.
[0019]
【The invention's effect】
As described above, according to the present invention, a sensor is disposed in the vicinity of the pair of conveyance rollers, and the sheet conveyed by the sensor is being conveyed while being sandwiched between the pair of conveyance rollers, or comes out of this conveyance state. The sheet conveyance state determination unit is provided, and the discharge roller pair provided downstream of the conveyance roller pair is configured to be close to and away from each other, and the determination result by the sheet conveyance state determination unit is Roller distance control / addition is carried out by holding the gap between the discharge roller pair at a set interval when being sandwiched between the conveyance roller pair and leaving the conveyance state when it is out of the conveyance state. By adopting a configuration in which the pressure unit and the discharge roller contact / separation control unit are provided, the sheet conveyance and discharge speed of the discharge roller pair is faster than the sheet conveyance speed of the conveyance roller pair, and the length of the sheet in the conveyance direction. Even when the span is longer than the span between the transport roller pair and the discharge roller pair, the sheet is not held by both the transport roller pair and the discharge roller pair at the same time. It is possible to prevent the folding form of the sheet from collapsing, dirt on the slip marks of the roller on the sheet, tearing of the sheet, an annoying slip noise, abnormal noise coming out of the roller, etc. is there.
[Brief description of the drawings]
FIG. 1 is an arrangement side view showing an embodiment of the present invention.
FIG. 2 is an arrangement side view showing a relationship between a sheet conveying apparatus and a sheet for explaining operations and effects of the embodiment shown in FIG.
FIG. 3 is an arrangement side view illustrating an example of a conventional sheet conveying apparatus.
4 is an arrangement side view showing the relationship between the sheet conveying apparatus and the sheet for explaining the operation and problems of the sheet conveying apparatus shown in FIG. 3;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 100 Conveyance path mechanism 110 Conveyance path belt 120,130 Conveyance path roller 200 Conveyance roller pair mechanism 210 Upper surface side conveyance roller 220 Lower surface side conveyance roller 230 Pressurization part 300 Sheet conveyance state discrimination | determination part 310 Sensor 400,400x Discharge roller pair mechanism 410 Upper surface Side discharge roller 420 Lower surface side discharge roller 430 Roller interval control / pressure unit 431 Support plate 432 Cam 433, 433x Pressure spring 900 Sheet

Claims (4)

A sheet conveying apparatus that receives a sheet of drawings, documents, and papers from the conveying upstream side thereof, conveys and discharges the sheet downstream, and has the following configurations.
(B) A conveyance path mechanism including a conveyance path belt and a conveyance path roller that places the sheet on the upper surface and conveys the sheet downstream at a predetermined speed. (B) Located on the upper surface side and the lower surface side of the conveyance path belt. A transport roller pair mechanism including an upper surface side transport roller and a lower surface side transport roller that sandwich the sheet on the transport path belt and transport it downstream with the transport path belt. (C) The upper surface side transport roller and the lower surface side transport A sheet that includes a sensor disposed in the vicinity of the roller, and determines whether the sheet on the conveyance path belt is being conveyed by being sandwiched between the upper surface side conveyance roller and the lower surface side conveyance roller, or whether the sheet has exited from this conveyance state. Conveyance state determination unit (d) An upper surface disposed so as to be close to and away from the upper surface side and the lower surface side of the downstream portion of the sheet conveyance path by the conveyance path mechanism and the conveyance roller pair mechanism. The side discharge roller and the lower surface side discharge roller, and the upper surface side discharge roller and the lower surface side discharge roller are moved in a direction approaching each other based on the contact / separation control signal and are held apart at a set mutual interval. A discharge roller pair mechanism that conveys and discharges the sheet downstream at a faster speed than the conveyance path mechanism and the conveyance roller pair mechanism. (E) A discharge roller that generates the contact / separation control signal, when the determination result of the sheet conveyance state determination unit is sandwiched between conveyance rollers and during separation, and when it is out of the conveyance state, an approach command is generated. Contact / separation controller The discharge roller pair mechanism has a movable structure in which one of the upper surface side discharge roller and the lower surface side discharge roller is held at a fixed position, and the other is movable toward and away from the one. The sheet conveying apparatus according to claim 1, wherein the control / pressurizing unit moves the discharge roller of the other movable structure according to the contact / separation control signal so as to approach and separate the discharge rollers. In the discharge roller pair mechanism, the upper surface side discharge roller of the upper surface side discharge roller and the lower surface side discharge roller has a movable structure, and the roller interval control / pressurizing unit moves the upper surface side discharge roller to the lower surface side. The roller spacing control / pressurizing unit is held at a fulcrum and can be rotated around the fulcrum, and the upper end discharge roller is moved at the first end side. By moving the support plate moved with respect to the lower surface side discharge roller and the second end side of the support plate different from the first end side by the contact / separation control signal, the first end side A roller interval control means for controlling the approach and separation between the upper surface side discharge roller and the lower surface side discharge roller, and a pressure spring that applies pressure between the upper surface side discharge roller and the lower surface side discharge roller. Item 2 Sheet conveying apparatus. The discharge roller pair mechanism is a cam in which the roller interval control / roller interval control means of the pressure unit is rotatable around a fixed central axis and the outer periphery thereof is in contact with the other end side of the support plate. The sheet conveying apparatus according to claim 3, wherein the upper surface side discharge roller and the lower surface side discharge roller are moved closer to and away from each other by a difference in length between the central axis and the outer periphery of the cam.

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