JP2006003514A - Sheet-like body positioning/conveyance mechanism and image recording apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet-like body positioning/conveyance mechanism in which torque of a stepping motor is relatively small when the stepping motor is used as a driving source for truing up and positioning a sheet-like body conveyed, such as a film, and which can accurately position sheet-like bodies even when the sheet-like bodies are uneven in dimension, and to provide an image recording apparatus. <P>SOLUTION: The sheet-like body positioning/conveyance mechanism has a conveying means to convey a sheet-like body F and a correcting means to correct the position of the conveyed sheet-like body in a direction (w) perpendicular to the conveyance direction H and to position the sheet-like body, wherein the correcting means has a pair of side edge truing-up members 1, 2 which performs normal and reverse movement in a direction nearly perpendicular to the conveyance direction and are engaged with the sheet-like body to true up the side edge of the sheet-like body, and a stepping motor for driving the side edge truing-up members configured such that the stepping motor steps out when a load value produced at the time of positioning the sheet-like body by the side edge truing-up members exceeds a predetermined threshold value (th). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sheet-like body positioning / conveying mechanism and an image recording apparatus that position and convey a sheet-like body in a direction orthogonal to the conveying direction.

  In an image recording device that exposes a photothermographic film by irradiating a photothermographic film at the exposure unit and heat-develops it at the development unit to visualize the latent image, the position in the width direction of the film when being conveyed to the exposure unit is positioned Positioning is performed by shifting the width of the mechanism (see Patent Document 1 below). The photothermographic film is usually coated with an emulsion on a PET base of about 170 μm and has a thickness of about 200 μm.

  Normally, at the time of film cutting, as shown in FIG. 8, the 14-inch width is cut into several places (slitter direction) from the wide original winding, and this 14-inch width roll is further cut into three sizes of 17, 14, 11 (Cross direction). The reason for cutting to 14 inches wide is that the above three sizes occupy most of the amount used in the market. The other sizes are cut into dedicated width rolls (8 inches in the above example), and then cut into 10 inches, resulting in a six-cut size. Although variation in dimensions due to cutting occurs in both the slitter direction and the cross direction, generally, the variation in dimension in the cross direction is larger than that in the slitter direction.

  When the photothermographic film as described above is moved by using a pair of width-adjusting claws, as shown in Patent Document 2 below, by giving a curvature to the conveyance path in the conveyance direction, along the conveyance path. Since the film has a predetermined rigidity, the film is pressed by one width-shifting claw, and the film itself is moved and width-wise while maintaining its posture without being deformed (buckling). After that, when both the width-shifting claws are locked, they are elastically deformed with the stroke of the width-shifting claws (width-shifting) and the center is bent into a convex shape (medium convex shape). If the centering of the film is bent into a convex shape and the middle nail is released, the elastic energy accumulated by the bending is released and the position of the film may be shifted. .

When the drive system for moving the above-mentioned width adjusting claw in the left-right direction orthogonal to the conveying direction is configured to include a pulse motor (stepping motor) as in Patent Document 2, conventionally, when the pulse motor is selected, the width adjusting is conventionally performed. After selecting the moving speed, a model was selected that exhibits a powerful power (output torque) that can match the moving speed and move the film in a convex shape. It was.
JP 2003-167300 A JP 2004-99204 A

  In view of the above-described problems of the prior art, the present invention has a stepping motor with a relatively small torque when a driving source for positioning a sheet-like body such as a film to be transported is made closer. It is an object of the present invention to provide a sheet-like body positioning / conveying mechanism and an image recording apparatus which can be accurately positioned even if the sheet-like body is dimensional variation.

  In order to achieve the above object, the sheet-like body positioning and transporting mechanism according to the present invention comprises a transport means for transporting a sheet-like body, and a correction for correcting and positioning the position of the transported sheet-like body in a direction orthogonal to the transport direction. Means, and the correction means moves forward and backward in a direction substantially orthogonal to the conveying direction, engages with the sheet-like body, and narrows the sheet-like body, and the width A stepping motor for driving the shifting member, and an output torque of the stepping motor is selected so as to have a predetermined relationship with a load value generated in the positioning process of the sheet-like member of the width shifting member. It is characterized by that.

  According to this sheet-like body positioning and conveying mechanism, the load value generated when the width adjusting member driven by the stepping motor moves and engages with the sheet-like body changes according to the engagement state. Since the output torque is selected so as to have a predetermined relationship with the load value generated in the positioning process, for example, the stepping motor is selected to step out according to the load value when the sheet-like body is positioned. By doing so, positioning is completed at the time of the step-out. As described above, since the control is based on the output torque that is a characteristic of the stepping motor, the torque of the stepping motor can be relatively small, and the control is based on the load value generated when engaging the sheet-like body. Even if there are variations in the dimensions of the sheet-like body, positioning can be performed with high accuracy.

  After the sheet-like body is engaged with the width adjusting member and positioned at the target position in the sheet-like body positioning conveyance mechanism, the stepping motor steps out in a state where the sheet-like body is kept flat. The output torque is preferably selected. Thereby, since the sheet-like body is positioned at the target position before elastically deforming to the middle convex shape, it is possible to prevent the position of the sheet-like body from being changed due to the elastic return from the middle convex shape after the positioning.

  Further, a predetermined threshold value between a first load value generated when the sheet-like body is partially engaged with the width adjusting member and a second load value generated when the width adjusting correction is completed. The stepping motor can be configured to step out when the load value exceeds the predetermined threshold.

  In addition, the conveying means can position a plurality of sizes of sheet-like bodies, and in this case as well, control is performed based on the load value generated when engaging with the sheet-like bodies. Positioning can be performed with high accuracy.

  Moreover, the said correction | amendment means can be comprised so that it may have a pair of said width adjustment members, and the said sheet-like body may be width-adjusted on the center reference | standard with the said pair of width adjustment members. The pair of width-shifting members are rotated linearly via the rack and pinion structure by the torque of the stepping motor.

  An image recording apparatus according to the present invention includes a conveying unit that conveys a sheet-like medium, an exposure unit that scans the conveyed sheet-like medium to form a latent image, and the sheet-like medium with respect to the scanning of the exposing unit. An image recording apparatus comprising: a correction unit that corrects and positions a position in a direction orthogonal to the conveyance direction; and a control unit that controls the conveyance unit, the exposure unit, and the correction unit, wherein the correction unit includes the conveyance unit At least one width-shifting member that moves forward and backward in a direction substantially perpendicular to the direction and engages with the sheet-shaped medium to width the sheet-shaped medium, and a stepping motor that drives and moves the width-aligning member. The output torque of the stepping motor is selected so as to have a predetermined relationship with the load value generated in the positioning process of the sheet-like medium of the width adjusting member. To.

  According to this image recording apparatus, although the load value generated when the width adjusting member driven by the stepping motor moves and engages with the sheet-like medium changes according to the engagement state, the output torque of the stepping motor Is selected to have a predetermined relationship with the load value generated in the positioning process, for example, by selecting the stepping motor to step out according to the load value when the sheet-like medium is positioned. The positioning is completed at the time of the step-out. As described above, since the control is based on the output torque which is a characteristic of the stepping motor, the torque of the stepping motor can be relatively small, and the control is based on the load value generated when engaging with the sheet-like medium. Even if there is a dimensional variation of the sheet-like medium, it can be accurately positioned. Therefore, the latent image obtained by scanning the exposure unit can be formed on the sheet-like medium at an accurate position.

  In the image recording apparatus, after the sheet-like medium is engaged with the width adjusting member and positioned at a target position, an output torque is generated so that the stepping motor steps out in a state where the sheet-like medium is kept flat. Is preferably selected. Thereby, since the sheet-like medium is positioned at the target position before elastically deforming to the middle convex shape, it is possible to prevent the position of the sheet-like medium from being changed due to the elastic return from the middle convex shape after the positioning.

  Further, a predetermined threshold value is between a first load value generated when the sheet-like medium is partially engaged with the width adjusting member and a second load value generated when the width correcting is completed. The stepping motor can be configured to step out when the load value exceeds the predetermined threshold.

  The conveying means can position a plurality of sizes of sheet-like media, and the control means can perform the same control regardless of the size. Since the control is performed based on the load value generated when engaging with the sheet-like medium in each size, the sheet-like body of each size can be accurately positioned.

  The sheet-like medium has a predetermined dimensional size, and the control means can perform the same control regardless of variations in the dimensional size.

  Moreover, the said correction | amendment means can be comprised so that it may have a pair of said width adjustment members, and the said sheet-like medium may be approximated by a center reference | standard with the said pair of width adjustment members.

  According to the sheet-like body positioning / conveying mechanism and the image recording apparatus of the present invention, when the stepping motor is used as the driving source for bringing the sheet-like body / sheet-like medium to be conveyed closer and positioned, the torque of the stepping motor Can be relatively small, and even if there is a variation in the dimensions of the sheet-like body or sheet-like medium, positioning can be performed with high accuracy.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  <First Embodiment>

  1A and 1B are a main part plan view (a) and a main part front view (b) schematically showing a sheet-like body positioning / conveying mechanism according to the first embodiment. FIG. 2 is a top view (a) and a side view (b) of a main part of the sheet-like body positioning and conveying mechanism of FIG.

  As shown in FIGS. 1 and 2, the sheet-like body positioning / conveying mechanism includes a first pair of racks 1 b, 2 b formed on side portions 1 a, 2 a that are substantially L-shaped and face each other in parallel. The second width adjusting members 1 and 2, a stepping motor 7 capable of rotating in the forward and reverse directions, a pinion 3 rotated by the stepping motor 7 via the gear 7a and meshed with the racks 1b and 2b of the width adjusting members 1 and 2. A pair of conveying rollers 4 disposed on the upstream side of the width adjusting members 1 and 2 so as to convey the sheet-like film F in the conveying direction H.

  As shown in FIG. 1A, when the pinion 3 rotates in the rotation direction r due to the normal rotation of the stepping motor 7, the first and second width-shifting members 1 and 2 are crossed in the width direction w orthogonal to the transport direction H. And move toward the both side edges of the film F to narrow the film F. Further, when the pinion 3 rotates in the rotation direction r ′ due to the reverse rotation of the stepping motor 7, the width direction w opposite to the width direction w perpendicular to the conveyance direction H of the first and second width adjusting members 1 and 2. 'Move away from each other.

  As shown in FIG. 1B, the light reflection type position sensor 6 is disposed above the upper end surface 2 c of the second width adjusting member 2. When the second width adjusting member 2 moves to the home position 6a as shown in FIG. 2A, the position sensor 6 detects the upper end surface 2c, and the stepping motor 7 stops at the home position 6a by this detection signal. Since the first and second width adjusting members 1 and 2 are moved by the same amount of movement by the common pinion 3, when the second width adjusting member 2 is located at the home position 6a, the first width The closing member 1 is also at the home position.

  As shown in FIG. 2B, the conveying roller pair 4 includes a driving roller 4a and a driven roller 4b, and the driven roller 4b can be released from pressure bonding, and a nip capable of conveying a film at a solid line position with respect to the driving roller 4a. And the nip is released at the position of the broken line.

  As shown in FIG. 2A, when any one of the films F 1, F 2, F 3 having a plurality of sizes is conveyed, the first and second width adjusting members 1, 2 are connected to the stepping motor 7. By rotating, the film moves from the home position in the width direction w and engages with the side edge of the film F, thereby bringing the film F closer to the target position.

  Here, the stepping motor will be described with reference to FIG. FIG. 3 is a curve showing the relationship between the rotation speed and output torque of the stepping motor of FIG.

  The stepping motor can obtain the number of rotations corresponding to the number of pulses input (number of pulses per second). However, if an overload is applied, the relationship between the rotor and the stator is disturbed and the desired rotation cannot be obtained. Toning phenomenon occurs. When the stepping motor has a relationship between the rotational speed and the output torque as shown by curve a in FIG. 3, for example, the required torque must be inside curve a (curve c side), and the required torque is the curve a. If it is on the outer side (curve b side), the stepping motor will not rotate normally and will be out of step.

  In the present embodiment, the first and second width adjusting members 1 and 2 driven by the stepping motor 7 move from the home position in the width direction w, engage with the side edge of the film F, and adjust the width. The film F is positioned at the target position, and at this time, the film F is not elastically deformed into a middle convex shape. The load value generated when the film F is engaged with the side end of the film F changes according to the engagement state, and the load value increases as the engagement proceeds, but the load value (required torque) is a predetermined value. Stepping motor 7 will step out, and the first and second width adjusting members 1 and 2 cannot be driven (moved). In this way, the film F is positioned in a step-out state. Accordingly, when the film F is elastically deformed into a convex shape and positioned at the target position, the maximum load value is generated by the engagement by the width-shifting members 1 and 2, and when this load value is reached, the stepping motor Select the stepping motor so that 7 will step out.

  For example, when the step-out torque of the stepping motor 7 is between the curve a and the curve b in FIG. 3, a stepping motor having the characteristics of the curve a or c is selected. Further, when the step-out torque of the stepping motor 7 is between the curve a and the curve c in FIG. 3, a stepping motor having the characteristic of the curve c is selected.

  Specifically, a predetermined threshold value is set between the load value generated when the first and second width adjusting members 1 and 2 are partially engaged with the side edges of the film F and the maximum load value. The stepping motor 7 is selected so that the step-out torque becomes a predetermined threshold value (or a value in the vicinity thereof).

  Next, an operation of positioning and conveying by the sheet-like body positioning and conveying mechanism of FIGS. 1 to 3 will be described with reference to FIG. FIG. 4 is a diagram schematically showing a state in which the film F in a biased position is transported by the sheet-like body positioning transport mechanism in FIGS. It is.

  As shown in FIG. 4, the film F is transported in the transport direction H with the side edges Fa and Fb being substantially parallel to the first and second width adjusting members 1 and 2 but being biased toward the side end Fb. When the first and second width adjusting members 1 and 2 start moving in the width direction w from the home position 6a by the rotation of the stepping motor 7, first, the second width adjusting member 2 is moved to the side edge Fb of the film F. Until the first width adjusting member 1 is engaged with the side end Fa, the width is partially increased at the side end Fb on one side, and the load value due to the reaction force from the film F increases from t1 to t2. To do.

  Next, when the first and second width adjusting members 1 and 2 further move in the width direction w and the first width adjusting member 1 engages with the side end Fa as well as the side end Fb side of the film F. The film F is positioned at the target position without being elastically deformed into a middle convex shape. At this time, since the film F is engaged with the width-shifting members 1 and 2 at both side edges Fa and Fb, the load value due to the reaction force from the film F rises rapidly from t2 to t3 beyond a predetermined threshold th. Thereafter, the relationship between the rotor and the stator of the stepping motor is reset, the motor is reversed in the separating direction, and the width adjusting members 1 and 2 are returned to the home position (position setting may be different for each size), and the conveying roller pair Is pressed to convey the positioned film.

  As described above, since the load value due to the reaction force from the film F exceeds the predetermined threshold th, the stepping motor 7 steps out. For this reason, the stepping motor 7 cannot move the film F any further, and the film F is positioned at the target position without being further elastically deformed (without being bent) without being further narrowed. In this positioning state, it is conveyed.

  Next, the operation of positioning and conveying the film F at a biased and bent position will be described with reference to FIG. FIG. 5 schematically shows how the film F in a biased and bent position is transported by the sheet-like body positioning transport mechanism in FIGS. 1 and 2 and positioned at the target position, and the relationship between the width-shifting position of the width-shifting member and the load. FIG.

  As shown in FIG. 5, the film F is transported in the transport direction H in a state where the side ends Fa and Fb are bent with respect to the first and second width-adjusting members 1 and 2 and biased toward the side end Fb. First, when the second width adjusting member 2 is partially engaged with the side end Fb of the film F, the load value due to the reaction force from the film F increases from t11 to t12.

  Next, the first and second width adjusting members 1 and 2 further move in the width direction w, and the first width adjusting member 1 partially engages with the side end Fa of the film F. Thus, since the film F is partially engaged with the width adjusting members 1 and 2 at both side ends Fa and Fb, the load value due to the reaction force from the film F increases from t12 to t13, but the film F also moves. Therefore, it does not increase so much.

  Further, when the first and second width adjusting members 1 and 2 are moved, the film F becomes parallel when both side edges Fa and Fb engage and follow the width adjusting members 1 and 2, and the film F has a convex shape. It is positioned at the target position without elastic deformation. At this time, since the film F is engaged with the width adjusting members 1 and 2 at both side ends Fa and Fb, the load value due to the reaction force from the film F rises from t13 to t14 beyond a predetermined threshold th. Thus, since the load value due to the reaction force from the film F exceeds the predetermined threshold th, the stepping motor 7 steps out. For this reason, the stepping motor 7 cannot move the film F any further, and the film F is positioned at the target position without being further elastically deformed (without being bent) without being further narrowed. In this positioning state, it is conveyed.

  As described above, according to the sheet-like body positioning / conveying mechanism of FIGS. 1 to 3, the drive system that moves the pair of width adjusting members in the left-right direction (width direction w, w ′) includes the stepping motor 7. By selecting the output torque of the stepping motor 7, as shown in FIG. 4 and FIG. 5, after the width adjustment of the film F is completed (position correction completed), it is strong even if the width adjustment members 1 and 2 try to move further. Since the reaction force from the film acts, the stepping motor 7 is stepped out. Therefore, the stepping motor 7 is positioned in the width direction accurately while being locked to the left and right width-shifting members 1 and 2, and has a convex shape. Therefore, the elastic energy stored in the film itself is not released and the film is not shifted from the correction position.

  Conventionally, when selecting a pulse motor, a model that exerts a powerful output torque that moves the film in a convex shape has been selected, and the cost of the parts has also increased. This makes it possible to use this type of pulse motor, which can reduce the cost of components and improve the width-shifting performance.

  Further, the control of the width adjusting members 1 and 2 in the width adjusting direction (width direction w) may be the same regardless of the film sizes F1, F2 and F3 as shown in FIG. Is preferred.

  In addition, since the width adjusting members 1 and 2 only shift the step-out point according to the state where both side ends of each film are locked, the center in the film width direction is always the same, and it is necessary to consider variation in film cutting. There is no.

  In particular, in the case of a small-sized film (for example, six-cut longitudinal conveyance), the load value difference Δt (t14−t13) in FIG. 5 becomes large due to the aspect ratio of the film. The degree increases, which is preferable.

  <Second Embodiment>

  Next, an image recording apparatus including the sheet-like body positioning / conveying mechanism described with reference to FIGS. 1 to 5 will be described with reference to FIGS.

  FIG. 6 is a front view showing a main part of the image recording apparatus according to the second embodiment. FIG. 7 is a diagram schematically showing an exposure unit of the image recording apparatus of FIG.

  As shown in FIG. 6, the image recording apparatus 100 is loaded with a package in which a predetermined number of photothermographic films (hereinafter also referred to as “films”), which are sheet-like photothermographic materials, are packaged. And a second loading unit 11, 12, a supply unit 110 having a conveyance unit 5 for conveying the film one by one for exposure and development, and exposing the film fed from the supply unit 110 to expose a latent image. An exposure unit 120 to be formed, a thermal development unit 130 to thermally develop a film on which a latent image is formed, and a cooling and conveyance unit including a densitometer 200 and a conveyance roller 144A that measure density of the developed film and obtain density information 150.

  The first loading unit 11 and the second loading unit 11 of the supply unit 110 are loaded with films of different sizes, respectively, and the film from the first loading unit 11 or the second loading unit 12 is transported one by one. It is conveyed by the conveying roller pair 139, 140, 141 in the arrow direction (1) in FIG. A pair of transport rollers 139, 140, and 141 transports the film downward toward the exposure unit 120.

  Next, the film is horizontally transported by the transport roller pair 4 in the arrow direction (2), and further irradiated with laser light from the exposure unit 120 while being sub-scanned and transported by the transport roller pair 142 to form a latent image.

  Next, the sheet is conveyed in the arrow direction (3) by the conveying roller pairs 146, 145, 144, and 143. A pair of transport rollers 146, 145, 144, 143 lifts and transports the film on which the latent image is formed toward the heat developing unit 130.

  Next, the latent image of the film is visualized by the heat developing unit 130, and the film is further conveyed by the conveyance roller 144 </ b> A in the direction of arrow (4), cooled by the cooling conveyance unit 150, and then discharged to the discharge unit 160. The conveyance roller pairs 139, 141, 4, 142, 146, 145, 144, and 143 are driven to rotate by a motor or the like.

  Next, the exposure unit will be described. As shown in FIG. 7, the exposure unit 120 deflects the laser light L, which has been intensity-modulated based on the image signal S, by the rotary polygon mirror 113 to perform main scanning on the film F, and converts the film F into the laser light L. On the other hand, it is sub-scanned by relative movement in a direction substantially perpendicular to the main scanning direction, and a latent image is formed on the film F using the laser beam L.

  A more specific configuration of the exposure unit 120 will be described below. In FIG. 7, image data output from an external image output device 121 is received via a network or the like, and an image signal S that is a digital signal of the image data is converted into an analog signal by a D / A converter 122. , And input to the modulation circuit 123. Based on the analog signal, the modulation circuit 123 controls the driver 124 of the laser light source unit 110a to irradiate the laser beam L modulated from the laser light source unit 110a.

  The laser light L emitted from the laser light source unit 110a passes through the lens 112, is converged only in the vertical direction by the cylindrical lens 115, and rotates on the rotary polygon mirror 113 that rotates in the arrow A 'direction in the figure. It is made to enter as a line image perpendicular to. The rotary polygon mirror 113 reflects and deflects the laser light L in the main scanning direction, and the deflected laser light L passes through an fθ lens 114 including a cylindrical lens formed by combining two lenses and then enters the optical path. The arrow X is reflected on the surface to be scanned 117 of the film F reflected by the mirror 116 extending in the main scanning direction and conveyed (sub-scanned) in the arrow Y direction by the conveying roller pair 142. Main scanning is repeated in the direction. That is, the laser beam L is scanned over the entire surface to be scanned 117 on the film F. In this way, a latent image based on the image signal S is formed on the film F.

  As shown in FIG. 7, on the upstream side of the conveying roller pair 142 of the exposure unit 120, a conveying roller pair 4 similar to that in FIGS. 1 and 2 is arranged, and the conveying roller pair 4 and the conveying roller pair on the downstream side thereof. A sheet-like body positioning / conveying mechanism similar to that shown in FIGS. For this reason, as shown in FIGS. 4 and 5, even if the film F is transported in a state of being biased or bent from the transport roller pair 141, it is accurately positioned in the width direction by the width-shifting members 1 and 2. The exposure unit 120 is exposed and scanned with laser light, and a latent image obtained by scanning of the exposure unit 120 can be formed at an accurate position on the film F.

  As shown in FIG. 6, the heat developing unit 130 has a heating drum 14 that can be heated while holding the film F in close contact with the outer periphery, and the heating drum 14 is an inner sleeve of a rotatable aluminum cylinder. It is heated to a predetermined temperature by energization control on a heater that is a heating source attached to the peripheral surface.

  As shown in FIG. 6, a plurality of counter rollers 16 having a smaller diameter than the heating drum 14 as guide members and pressing members are provided outside the heating drum 14. Are arranged in parallel to the outer peripheral surface of the heating drum 14.

  The heating drum 14 is formed on the film F by maintaining the film F at a predetermined heat development time above a predetermined minimum heat development temperature while rotating with the film F sandwiched between the opposing rollers 16. The latent image is formed as a visible image. Here, the minimum heat development temperature is a minimum temperature at which the latent image formed on the film F starts to be thermally developed, and is, for example, 95 ° C. or higher. On the other hand, the heat development time refers to a time that should be maintained at a temperature equal to or higher than the minimum heat development temperature in order to develop the latent image on the film F to a desired development characteristic. In addition, it is preferable that the film F is a thing which is not substantially thermally developed at 40 degrees C or less.

  As described above, the best mode for carrying out the present invention has been described. However, the present invention is not limited to these, and various modifications are possible within the scope of the technical idea of the present invention. For example, the sheet-like body positioning and conveying mechanism described with reference to FIGS. 1 to 5 may be applied to a type of image recording apparatus other than the image recording apparatus as shown in FIG. The present invention can be applied to various apparatuses that convey a state body.

  Moreover, although it was set as the structure which width-shifts by a pair of width-shifting member in FIG. 1, FIG. 2, it is needless to say that the structure which width-shifts by one width-shifting member may be sufficient.

It is the principal part top view (a) and principal part front view (b) which show schematically the sheet-like body positioning conveyance mechanism by 1st Embodiment. FIG. 2 is a main part top view (a) and a main part side view (b) of the sheet-like body positioning and conveying mechanism in FIG. 1. It is a curve which shows the relationship between the rotational speed and output torque of the stepping motor of FIG. It is a figure which shows typically the mode of conveying the film F in the biased position with the sheet-like body positioning conveyance mechanism of FIG. 1, FIG. 2, and positioning to the target position, and the relationship between the width alignment position of a width alignment member, and load. FIG. 3 is a diagram schematically showing a state in which a film F in a biased and bent position is transported by the sheet-like body positioning transport mechanism in FIGS. is there. It is a front view which shows the principal part of the image recording device by 2nd Embodiment. It is a figure which shows schematically the exposure part of the image recording apparatus of FIG. It is a top view for demonstrating the method of cutting a film from the wide original winding.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 1st and 2nd width adjustment member 1a, 2a Side surface part 1b, 2b Rack 3 Pinion 4 Conveyance roller pair 4b Follower roller 5 Stepping motor 6 Position sensor 6a Home position 7 Stepping motor 11,12 Loading part 14 Heating drum 16 Opposing roller 100 Image recording device 120 Exposure unit 130 Thermal development unit F Film (sheet-like body, sheet-like medium)
Fa, Fb side edge H conveyance direction th threshold value w, w ′ width direction

Claims (11)

Conveying means for conveying the sheet-like body;
Correction means for correcting and positioning the position in the direction orthogonal to the conveyance direction of the conveyed sheet-like body,
The correction means includes at least one width-shifting member that moves forward and backward in a direction substantially orthogonal to the transport direction and engages with the sheet-like body to reduce the width of the sheet-like body, and a stepping that drives the width-adjusting member. A motor,
A positioning and conveying mechanism, wherein the output torque of the stepping motor is selected so as to have a predetermined relationship with a load value generated in the positioning process of the sheet-like body of the width-adjusting member.   After the sheet-like body is engaged with the width adjusting member and positioned at the target position, the output torque is selected so that the stepping motor steps out in a state where the sheet-like body remains flat. The sheet-like body positioning and conveying mechanism according to claim 1.   A predetermined threshold value is set between a first load value generated when the sheet-like body is partially engaged with the width adjusting member and a second load value generated when the width adjusting correction is completed. 3. The sheet-like object positioning / conveying mechanism according to claim 1, wherein the stepping motor steps out when the load value exceeds the predetermined threshold value.   4. The sheet-like body positioning / conveying mechanism according to claim 1, wherein the conveying means is capable of positioning a plurality of sizes of sheet-like bodies.   The said correction | amendment means has a pair of said width-shifting members, and width-shifts the said sheet-like body on the center reference | standard with the said pair of width-shifting members, The one of the Claims 1 thru | or 4 characterized by the above-mentioned. The sheet-like body positioning conveyance mechanism according to item 1. Conveying means for conveying the sheet-like medium;
Exposure means for scanning the conveyed sheet-like medium to form a latent image;
Correction means for correcting and positioning the position in the direction perpendicular to the conveyance direction of the sheet-like medium with respect to the scanning of the exposure means;
A control means for controlling the transport means, the exposure means and the correction means, and an image recording apparatus comprising:
The correction means includes at least one width-shifting member that moves forward and backward in a direction substantially orthogonal to the transport direction and engages with the sheet-like medium to reduce the width of the sheet-like medium, and a stepping that drives the width-adjusting member. A motor,
The image recording apparatus according to claim 1, wherein an output torque of the stepping motor is selected to have a predetermined relationship with a load value generated in the positioning process of the sheet-like medium of the width adjusting member.   After the sheet-like medium is engaged with the width adjusting member and positioned at the target position, an output torque is selected so that the stepping motor steps out in a state where the sheet-like medium is kept flat. The image recording apparatus according to claim 6.   A predetermined threshold value is set between a first load value generated when the sheet medium is partially engaged with the width adjusting member and a second load value generated when the width correction is completed. The image recording apparatus according to claim 6, wherein the stepping motor steps out when the load value exceeds the predetermined threshold value.   The image recording apparatus according to claim 8, wherein the transport unit can position a plurality of sizes of sheet-like media, and the control unit performs the same control regardless of the size.   The image recording according to any one of claims 6 to 9, wherein the sheet-like medium has a predetermined dimensional size, and the control unit performs the same control regardless of variations in the dimensional size. apparatus. The said correction | amendment means has a pair of the said width-shifting members, and width-shifts the said sheet-like medium on the center reference | standard with the said pair of width-shifting members, The Claim 1 characterized by the above-mentioned. Image recording device.

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