JPH0435885Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention is a type of copying machine that optically scans the original placed on the original table while it slides and copies it onto paper. The present invention relates to a document table movement stop device that transmits the driving force of the document table to the document table through a clutch, and stops the document table by cutting off the clutch.

"Prior Art" This type of conventional copying machine automatically performs all the reciprocating movements of the document table.
In the method disclosed in the publication, a spring clutch is used to switch the forward and backward movement of the document table, and the connection and disconnection of the spring clutch is indirectly controlled by an electromagnet through a link mechanism. There is.

``Problems that the invention attempts to solve'' However, according to this method, the switching of the spring clutch is indirectly controlled via a link mechanism by the operation of an electromagnet, so the structure is mechanically and electrically complicated. However, there were problems such as a large number of parts and high costs.

The purpose of the present invention is to eliminate such problems and to enable the clutch to be reliably switched by the moving force of the document table.

"Means for solving the problem" In this invention, a cam body is provided on the document table, and a stop switch is provided on the main body side, so that when the document table is moved to a predetermined position by the drive of the motor, the cam body is installed on the document table. A stop switch is activated by the body. The operation of this switch activates a delay circuit to suspend the motor for a predetermined period of time, and the movement of the document table during this predetermined period of time accurately activates the clutch release mechanism to release the clutch purely mechanically. Cut off. That is, it includes a locking member with a claw that is rotated by engaging with the cam body, and a check gear that meshes with the claw, and when the locking member with a claw is not rotated normally, the locking member with the claw rotates. A structure in which the rotation of the ratchet gear is restricted due to engagement and the clutch is placed in the connected state, and when the claw-equipped locking member is rotated by the cam body, the ratchet gear is disengaged from the claw portion and rotates to place the clutch in the disconnected state. That is.

``Operation'' When the document table moves to a predetermined position, a stop switch is actuated by a cam body provided thereon, and a delay circuit is activated to suspend stopping of the motor for a predetermined time. Movement of the document table during this time actuates the clutch release mechanism, mechanically releasing the clutch and stopping the document table. Since the clutch of the document table is disengaged, it can be moved back manually.

"Example" Hereinafter, an example of the present invention will be described in detail.

FIG. 1 (a perspective view seen diagonally from the rear on the right) shows the entire copying machine equipped with a document table movement stop device according to the present invention. This copying machine incorporates various mechanisms described later in a housing 1 that is slightly elongated from side to side and is constructed by combining an upper cover 1a and a lower cover 1b. It is attached so that it can slide freely. There is a start switch (push button) on the right end of the top surface of housing 1.
3, a rotary copy density adjuster 4, and a pilot lamp 5 are disposed, and a main power switch 6 is disposed on the rear surface of the housing 1. An elongated projection slit 7 is provided in the middle part of the upper surface of the housing 1 in the front and back, and below the projection slit 7, a fluorescent lamp 8 as a light source and its light are emitted into the housing 1 as shown in FIG. A concave reflective hood 9 is installed to direct the light to the surface.

The document table 2 holds the front and rear edges of a transparent glass plate 10 by front and rear side frames 11 and 12, and these side frames 11 and 12 are attached to front and rear rails 13 and 14 fixed on the housing 1. They are slidably fitted together, and the original (not shown) is attached to the glass plate 10.
Place it on top. On the rear frame 12 of this document table 2,
A cover plate 15 that covers the top of the glass plate 10 and holds down the original
is attached removably. The cover plate 15 is
A mounting base 16 fixed to the rear frame 12, a horizontally elongated hinge part 17, and a covering part 18 occupying most of the part are integrally connected, and the covering part 18 can be opened and closed with respect to the mounting base 16. It is. The covering part 18 has a sponge plate 21 attached to the lower surface of a hard upper plate 19 by a relatively flexible middle plate 20, and covers the glass plate 10 with elasticity.

When the original platen 2 slides to the right from its original position (the sliding limit position on the right side shown in FIG. is scanned. The light reflected from the original is refracted almost at right angles by a reflecting mirror 22 disposed diagonally below the slit 7, and is refracted at a nearly right angle by a light-shielding hood 2 disposed on the bottom surface inside the housing 1.
3 and is focused by the condensing lens 24 located at the right end of the light shielding hood 23.
The light enters a CCD type or MOS type image sensor 25 arranged at the right end almost horizontally, and is converted into an electrical signal as is known in the art. Shading hood 23
As shown in FIG. 3, the angle gradually narrows from the reflecting mirror 22 side toward the condensing lens 24 side. A shedding correction plate 26 is arranged substantially vertically on the light incident side of the condenser lens 24. This shedding correction plate 26 averages the distribution of the amount of light incident on the image sensor 25, and as shown in FIG. It is cut into an arc shape.

Further, inside the housing 1, a longitudinally long box-shaped roll paper tray 29 is disposed above the light shielding hood 23 slightly to the right of the middle portion thereof. In this copying machine, a wound thermal paper (roll paper) 30 is used as copy paper, and it is placed freely in the roll paper tray 29 without being supported pivotably, and is fed out to the right. ing.
A paper guide 3 is attached to the right (left side in FIG. 2) side wall 31 of the roll paper tray 29 from its upper edge.
2 are integrally extended, and the paper guide 32
A brake plate 33 is disposed above the brake plate 33 . The U-shaped lower end of this brake plate 33 is connected to the paper guide 32.
A braking passage 34 which is curved in a U-shape and is opposed to the U-shaped recess 32a at a predetermined interval,
is formed. A platen 36 is pivotally supported between the tip of the paper guide 32 and a paper discharge port 35 on the right side of the housing 1, and a line type thermal head 37 is installed above the platen. The thermal head 37 is pressed downward by a leaf spring 38 in order to press the thermal paper 30 against the platen 36 and make it sensitive to heat. This thermal head 37 is driven based on an electrical signal from the image sensor 25 as will be described later.

Therefore, when the platen 36 rotates, the thermal paper 30 comes into sliding contact with the lower end of the brake plate 33 in the brake path 34 and is fed out while being curved downward, that is, while being braked, so that the document surface on the document table 2 is moved against the thermal head. 37 and is thermally copied and discharged from the paper discharge port 35.

In order to detect when the thermal paper 30 has run out, a paper empty switch (for example, a micro switch) 39 is installed below the paper guide 32.
is installed. Operator 4 of this switch 39
0 enters the brake passage 34 through a hole 41 drilled in the paper guide 32 and clamps the thermal paper 30 with the lower surface of the brake plate 33, and turns on when the thermal paper 30 is pulled out from this gap. . In order to replace the thermal paper 30, etc., the right side of the upper cover 1a can be opened and closed by a lid plate 1c.

The rotation of the platen 36 and the forward movement of the document table 2 are performed by one motor 42 installed inside the housing 1.
This is done synchronously as follows:

That is, as shown in FIG. 5, the rotation of the motor 42 is transmitted to the platen 36 via its motor gear 42a, a plurality of intermediate gears 43 to 48 of different sizes, and a platen gear 49. Also, this platen 3
6 is transmitted from a pulley 51 fixed to the platen shaft 50 via a belt 52 to a pulley 54 fixed to the left lower shaft 53 of the housing 1, as shown in the same figure and FIG. . A reduction gear 55 is rotatably fitted to the lower shaft 53, and a spring clutch 56 is installed between the reduction gear 55 and the pulley 54. Reduction gear 5
5 meshes with a pinion 58 fixed to the upper shaft 57, and the pinion 58 meshes with a rack 12a provided on the lower surface of the rear frame 12 of the document table 2, as shown in FIGS. When the spring clutch 56 is in the connected state, the rotation of the pulley 54 is transmitted to the reduction gear 55, and the rotation of this gear propels the document table 2 to the left.

As shown in FIGS. 7 and 8, the spring clutch 56 is composed of a sleeve 59, a coil spring 60 spiraling in the direction A in FIG. 8, and an annular braking spring 61.
The protrusion 60a at one end is connected to the notch 6 of the sleeve 59.
A cylindrical loose fitting protrusion 63 protruding from the reduction gear 55 is rotatably loosely fitted into the coil spring 60, and the outer periphery of the sleeve 59 is fitted into the coil spring 60. A brake spring 61 is fitted into an annular groove 64 formed on the surface. Then, an annular ratchet gear 66 is fitted to one side of the flange 65 on the outer periphery of the sleeve 59, and the protrusion 68 of the brake spring 61 is fitted into the notch 67 to be locked to the ratchet gear 66. Further, the cylindrical protrusion 69 of the pulley 54 is tightly fitted into the coil spring 60.

In order to operate the spring clutch 56 toward and away from the spring clutch 56, a locking member 70, which is a lever, is rotatably fitted and supported on the upper shaft 57. The locking member 70 has upper and lower arm parts 72 and 73 protruding from a cylindrical bearing part 71, and a claw part 74 is formed at the lower end of the lower arm part 73. This locking member 71 constitutes a clutch release mechanism in conjunction with the ratchet gear 66, and is urged in a predetermined direction by a return spring 75, and normally engages the claw portion 74 with the teeth of the ratchet gear 66. It regulates its rotation.

On the other hand, at the right and left ends of the lower surface of the document table 2, as shown in FIG. 77 are provided protruding from each other.

Therefore, when the pulley 54 rotates in the direction of arrow B in FIG. 8 as the motor 42 rotates, the coil spring 60 is throttled by the cylindrical protrusion 69 of the pulley 54 because its helical direction is in the same direction. Rotate together with this so that it is rotated. Since the rotation of the ratchet gear 66 is normally restricted by the locking member 70, the pulley 54 is braked via the brake spring 68, and a braking force acts between the pulley 54 and the sleeve 59. For this reason, the coil spring 6
0 is further narrowed and loosely fits into the protrusion 63 of the reduction gear 55.
is tightened, and the pulley 54 and reduction gear 55 are connected to transmit the rotation of the former to the latter. As a result, the reduction gear 55 rotates in the direction of arrow C, and the pinion 58 meshing therewith rotates in the direction of arrow D, causing the document table 2 to move to the left (right in FIG. 5).
be promoted to

In this way, the document table 2 is slid to the left, and the end stop cam body 76 on the lower surface engages with the upper end of the upper arm 72 of the locking member 70, causing the locking member 70 to rotate. When the pawl 74 separates from the teeth of the ratchet gear 66, the ratchet gear 66 is allowed to rotate, so the braking force between the pulley 54 and the sleeve 59 disappears, and the coil spring 60 moves toward the reduction gear 5.
The loose fitting protrusion 63 of No. 5 is released. As a result, the pulley 54 and the brake gear 55 are cut off, that is, the spring clutch 56 is disconnected, and the pulley 54, sleeve 59, coil spring 60, and ratchet gear 66 rotate, but the rotation is not transmitted to the reduction gear 55. The document table 2 stops even if the motor 42 is rotating.

Thereafter, in order to return the document table 2 to its original position (right end position), the document table 2 is manually slid to the right by placing a hand directly on it. At this time, the pinion 58 rotates in the direction of arrow E and the reduction gear 55 rotates in the direction of arrow F, but since the loose fitting protrusion 63 of the reduction gear 55 is not tightened by the coil spring 60, it idles therein.
This rotation is not transmitted to sleeve 59 and pulley 54.

In order to electrically stop the motor 42, as shown in FIG. 5, an in-place stop switch 78 and a terminal stop switch are installed on the left side (right side in the figure) and right side of the upper arm 72 of the locking member 70. A switch 79 is provided for each. The in-place stop switch 78 has the above-described in-place stop cam body 7 on its actuator.
The end position stop switch 79 is turned on when the end stop cam body 76 engages with its actuator. In addition, a first switch,
As shown in FIGS. 3 and 9, a copy range setting switch 80 is provided, and this switch 80 is connected to copy range setting cam bodies 81 and 82 at both ends protruding from the lower surface of the rear frame 12 of the document table 2. It is turned on by engagement of .

Next, let's talk about the electrical configuration of this copying machine.
This will be explained with reference to Figures 0 and 11.

In FIG. 10, when the main switch 6 is turned on, 100V AC power is applied to the transformer 83, and a constant voltage generated by the constant voltage circuit 84 is input to the control circuit 85. Various electrical controls based on the operations of the start switch 3, copy density adjuster 4, paper empty switch 39, original position stop switch 78, end stop switch 79, and copy range setting switch 80 are all carried out by a control circuit 85. It is carried out by. Based on the control signal from the control circuit 85, the motor 42 is driven by a motor drive circuit 87 via a delay circuit 86, the fluorescent lamp 8 is turned on by a fluorescent lamp lighting circuit 88, and the thermal head is turned on. 37 is driven by a thermal head drive circuit 89.

In FIG. 11, when the start switch 3 is turned on, the motor 42 is immediately driven and rotates, and the platen 36 rotates at the same time as the document table 2 slides leftward from its original position (right end position). Also,
At the same time, the original position stopping cam body 77 on the lower surface of the document table 2 separates from the original position stopping switch 78, thereby turning off the original position stopping switch 78. Original table 2
When the copy range setting switch 80 is turned off by sliding a little from its original position (the copy range setting cam body 82 is separated), the fluorescent lamp 8 is turned on, and at the same time, the image sensor 25 is read. Thermal head 37 is driven, and while the thermal paper 30 is fed out, the original surface is copied onto it. When the original platen 2 further slides and the copy area setting switch 80 is turned on by the copy area setting cam body 81 on the lower surface, the fluorescent lamp 8 is turned off and the image sensor 25 and thermal head 37 are turned off. Since it is in the operating state, the copying action is stopped, but the motor 42 is further rotated, so the document table 2 continues to slide, and the platen 36 is also rotated, so that the thermal paper 30 is fed out in excess.
Note that the thermal paper 30 discharged from the paper discharge port 35
is cut appropriately at the edge of the paper discharge port 35.

After the copying operation is completed as described above, the original platen 2
When the switch 79 is slid slightly in the same direction, the end stop switch 79 is activated by the end stop cam body 76 on the lower surface of the end stop switch 79.
is turned on, but since the delay circuit 86 is activated at this time, the motor 42 does not stop immediately and continues to rotate for a predetermined period of time, so that the platen 36 continues to rotate and the document table 2 also slides extra. be done.
Due to this operation, the end stop cam body 7
6, when the locking member 70 is rotated as described above, the spring clutch 56 is disengaged, so that the document table 2 is stopped independently of the motor 42. When the delay operation of the delay circuit 86 is completed, the motor 42
The platen 36 also stops and the 1
The first copy operation is completed. Thereafter, in order to return the document table 2 to its original position, it is manually slid to the right as described above.

``Effects of the invention'' As detailed above, in this invention, when the document table moves to a predetermined position, the stop switch is activated by the cam body installed on it, and the delay circuit is activated to stop the motor at the predetermined time. Only time will be reserved. As the document table moves during this time, the cam body provided on the document table engages with a locking member with a claw installed at a predetermined position on the main body of the copying machine, and the locking member with a claw The ratchet gear, whose rotation was regulated by the clutch, rotates and the clutch is mechanically released, thereby stopping the document table. Therefore, since the clutch can be shut off purely mechanically and accurately as the document table moves, the structure is simpler and the number of parts is smaller than in the case of conventional electromagnets, making it economical. Further, the document table can be returned to its original position manually.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a partially cutaway perspective view of the entire copying machine, and FIG.
Figure 3 is a cross-sectional view, Figure 4 is a perspective view of the shading correction plate, Figure 5 is Figure 1-
A cross-sectional view of the line, FIG. 6 is a partial cross-sectional view of the same line,
7 and 8 are enlarged sectional views and exploded perspective views of the main parts of the present invention showing the relationship between the pulley, spring clutch, and deceleration mechanism, and FIG. 9 shows the copy range setting switch and the cam body that operates it. 10 is a block diagram, and FIG. 11 is a timing chart. 2...Original table, 42...Motor, 56...Spring clutch, 66...Ratchet gear, 70
... Locking member, 76 ... Cam body for end stop, 79
...Terminal stop switch, 86...Delay circuit.

Claims (1)

[Claims for Utility Model Registration] Driving force from a drive source such as a motor is transmitted to the document table via a clutch, and the document placed on the document table is optically scanned while sliding on the document table to generate paper. In a copying machine that shuts off the clutch and stops the document table when the document table moves to a predetermined position, a cam body 76 protrudes from the document table and the document table slides to a predetermined position. A stop switch 79 is activated by the cam body 76 when the switch is moved.
and a delay circuit 86 for continuously driving the motor for a predetermined period of time in response to the operation of the switch 79; and a delay circuit 86 for continuously driving the motor for a predetermined period of time in accordance with the operation of the switch 79; Furthermore, when the locking member 70 is slid to a predetermined position, it engages with the cam body 76 and rotates, and when the locking member 70 is not rotated, the rotation is restricted by engagement with the claw portion. The present invention is characterized by comprising a ratchet gear 66 which brings the clutch into the connected state and brings the clutch into the disconnected state when the locking member 70 is rotated by the end stop cam body 76 and disengages from the claw portion. A device for stopping the movement of the document table of a copying machine.