JPH0427885Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a pin feed tractor used in, for example, a form printing machine to convey continuous paper having marginal punches at both ends.

(Conventional technology and its problems) Conventional printing of business forms generally starts with roll paper, and after printing, marginal punches and folding machines are applied to both sides of the paper, and the paper is folded into continuous paper. This was done using a high-speed foam rotary press. However, form rotary presses are very large and require a lot of time to change and adjust printing patterns, and a large amount of waste paper is generated during the adjustment, so they are easy to handle for small-lot business form printing. Various forms printing machines using folded continuous paper have been developed. These form printing machines typically employ a paper transport mechanism that includes a pin feed tractor in order to achieve accurate paper feeding and improve printing accuracy.
That is, continuous paper having marginal punches at both ends thereof is used, and a pin feed tractor for conveying the continuous paper is placed on the entrance side of the printing position.

Now, these form printing machines for folded continuous paper can be used for printing on blank paper, and for printing on paper that has been preprinted by a form rotary press.
There are two ways to use it, but in either case, it is necessary to adjust the position of the paper in order to print correctly in a predetermined position in the vertical and width directions.
Looking specifically at the need to adjust the position in the paper width direction, when printing on blank paper, the distance between the two tractors must be adjusted to match the paper width. After making a test print, correct the paper position to compensate for the misalignment. If the paper width has expanded or contracted somewhat along the way, correct the paper position to match the marginal punch on the reference side. When reprinting, is the same. After making a test print, correct the paper position by the amount that is misaligned with the pre-printed print. If the position of the pre-printed print is gradually misaligned, change that print. There are methods to correct the paper position so that the print can be printed according to the position, and to correct the paper position when the width of the paper has expanded or contracted somewhat along the way so that it no longer matches the pre-printed print. .

In order to make such adjustments, conventional pin feed tractors are provided with an adjustment mechanism that allows the left and right tractor units to be moved independently in the paper width direction. However, it has the following drawbacks.

(a) Paper width adjustment, which adjusts the distance between the left and right tractor units to match the paper width, and paper position adjustment, which adjusts the paper position in the paper width direction, must be performed at the same time.Therefore, it is necessary to adjust the paper position after adjusting the paper width. In this case, the paper width adjustment must be performed again.

(b) The paper position cannot be adjusted while the paper is running.

Therefore, even in the case described above, printing will be resumed after paper feeding is stopped and correction is made. However, by doing this, the final printed product that becomes the product will have the pages before the correction and the page after the correction adjacent to each other, and the corrected area will be visible at a glance because of the step between the ruled lines, etc. That would be extremely inconvenient. That is,
Even if the printing misalignment is acceptable if corrected by gradual continuous changes, discontinuous changes will occur in the printing condition if printing is stopped and corrected, which is unacceptable for the final product. cause

As explained above, whether printing on blank paper or reprinting printed paper, conventional pin feed tractors cannot smoothly adjust the paper position in the paper width direction while the paper is running, which results in time and product costs. Loss (wasted paper) becomes a problem.

(Purpose of the invention) Therefore, the purpose of this invention is to solve the problems of the above-mentioned conventional technology and to separate paper width adjustment and paper position adjustment to smoothly perform paper position adjustment quantitatively and reproducibly during printing. The purpose of the present invention is to provide a pin feed tractor that can perform

(Means for Achieving the Object) In order to achieve the above object, the pin feed tractor according to this invention has a first row of paper conveying pins that engages with a marginal punch at one end of the continuous paper. a second tractor unit having a second paper conveyance pin row that engages with a marginal punch at the other end of the continuous paper; a guide section that supports and guides the paper conveyance pins so as to be movable in different directions; a spline shaft for synchronously driving the rows; a paper width setting member that is movably arranged parallel to the guiding direction of the guide section and fixes the first and second tractor units at arbitrary positions; and the paper width setting member. a paper position setting mechanism that integrally moves and adjusts first and second tractor units fixed to a member and having a paper width set therein in a direction parallel to the guiding direction of the guide section; In order to push the paper width setting member in one direction parallel to the guiding direction of the guide part, an end surface protruding from the one direction side is brought into contact with the paper width setting member side, and the end surface is movable in the one direction. It is configured to include a micrometer head having a spindle, and a spring body that biases the paper width setting member in the other direction parallel to the guiding direction of the guide section.

That is, first, the distance between the first and second tractor units is set for the paper width setting member to set the paper width, and then the spindle of the micrometer head in the paper position setting mechanism is moved forward and backward to maintain the set paper width while setting the first and second tractor units. , the second tractor unit is integrally moved by a predetermined amount in the paper width direction to adjust the paper position.

(Embodiment) FIGS. 1 and 2 are a plan view and a front cross-sectional view, respectively, showing the mechanism of an example of a pin feed tractor according to this invention.

This pin feed tractor 1 aligns a paper width reference tractor (hereinafter referred to as the first tractor) frame 2 and a paper width adjustment tractor (hereinafter referred to as the second tractor) frame 3 in parallel to sliders 4 and 5 of high precision linear bearings. After that, they are fixed, and each part of the first and second tractor units 6, 7 is attached to the first and second tractor frames 2, 3, respectively, to form a unit. Furthermore, the sliders 4 and 5 are slidable in the left and right direction along the guide rail 8 of the linear bearing, and the first and second tractor units 6, 7
The interval can be arbitrarily changed according to the paper width of the continuous paper 9.

The first and second tractor units 6 and 7 each have paper conveyance timing belts 10 and 11 wound around a pair of front and rear pulleys, and the left and right front pulleys are splined so as to be slidable relative to the pin feed tractor 1. They are connected by a shaft 12, and by rotationally driving this spline shaft 12, the left and right paper conveyance timing belts 10 and 11 move forward and backward in synchronization. Left and right paper conveyance timing belt 10,
Paper conveyance pins 13 are attached to the paper conveyance pins 11 at regular intervals, and by engaging marginal punches 14 at both left and right ends of the continuous paper 9 with these paper conveyance pins 13, the paper conveyance timing belts 10 and 11 are moved back and forth in synchronization. , the continuous paper 9 is fed forward and backward.

In addition, paper presser covers 15 and 16 are respectively disposed in the first and second tractor units 6 and 7 to cover the upper surface of the paper conveyance pin 13, and paper receiving guide plates 17 and 18 are disposed on the lower surface thereof, respectively. The left and right ends of the continuous paper 9 are sandwiched therebetween to guide the paper feed of the continuous paper 9 while preventing the marginal punch 14 from coming off the row of paper conveyance pins 13.

A guide rail 8 that supports the first and second tractor units 6 and 7 in a slidable manner in a direction perpendicular to the arrangement direction of the paper conveyance pins 13 has both ends connected to the left and right main frames 19 and 20 of the printing press body. The left and right brackets 21 and 22 are fixed by screws 23 in contact with the mounting reference surfaces of the left and right brackets 21 and 22, which are positioned and fixed at predetermined positions. Further, as described above, the spline shaft 12, which is slidable relative to the pin feed tractor 1 and is used to synchronously drive the rows of paper conveying pins 13, has its drive side shaft end connected to the left bracket 21.
It is fixed to a bearing (not shown).

A tractor-driving DC servo motor 24 is provided on the outside of the left main frame 19 of the printing press body, and a pulley 25 connected to the rotating shaft of this DC servo motor 24 is provided on the inside of the left main frame 19. The timing pulley 26 provided inside the left main frame 19 and this pulley 25
Wrap a timing belt (not shown) between the
The drive system is configured such that the timing pulley 26 is positioned and fixed on the spline shaft 12, and the spline shaft 12 is rotated in accordance with the rotation of the DC servo motor 24 to move the left and right paper conveyance timing belts 10, 11 forward and backward. ing.

A paper width setting rod 27 arranged parallel to the guide rail 8 sets the interval between the first and second tractor units 6 and 7 to match the paper width of the continuous paper 9, and maintains this set interval. , the position of the entire pin feed tractor 1 can be adjusted in the paper width direction of the continuous paper 9. , is fixed in advance to a predetermined position of this paper width setting rod 27 with a tightening bolt 29. Further, an arm 30 is joined and fixed to the mounting reference surface of the slider 5 of the second tractor unit 7, and this arm 30 has an adjustment knob for fixing the arm 30 to the paper width setting rod 27 at an appropriate position. 31 is installed.

The paper width setting rod 27 is mounted on bearings 3 attached to the left and right main frames 19 and 20 of the printing press body, respectively.
A paper position setting mechanism 34 is disposed on a bearing 32 on the left main frame 19 side, and a paper width setting rod 27 is supported by a micrometer head 35.
The first and second tractor units 6 and 7 fixed thereto are integrally moved in the paper width direction of the continuous paper 9. Further, a compression spring 37 is attached to the bearing 33 on the right main frame 20 side to urge the paper width setting rod 27 against the end surface of the spindle 36 of the micrometer head 35. The mechanism is such that the position of the pin feed tractor 1 is adjusted by a distance according to the advance and retreat of the pin feed tractor 1.

Upper and lower guide plates 38 and 39 are extended in front of the pin feed tractor 1, and the pin feed tractor 1
The continuous paper 9 fed out is inserted between them and guided.

Next, the operation will be explained. First, to adjust the paper width, press the marginal punch 1 on the left edge side of the continuous paper 9.
4 is engaged with the row of paper conveying pins 13 of the first tractor unit 6, and set on the paper receiving guide plate 17. Next, the second tractor unit 7 is slid toward the first tractor unit 6 along the guide rail 8, and as the marginal punch 14 on the right end side of the continuous paper 9 is moved, the paper conveying pin 1 of the second tractor unit 7 is moved.
Fix it in the position where it is engaged with row 3. This fixation is achieved by turning the adjustment knob 31 of the second tractor unit 7 clockwise, for example, so that the arm 30 is pressed against the paper width setting rod 27, and by the pressing force. After the right end of the continuous paper 9 is set on the paper receiving guide plate 18, the left and right paper presser covers 15, 16 are set so that the marginal punches 14 at both ends of the continuous paper 9 do not come off the row of paper conveying pins 13. Close.

Continuous paper 9 set in the first and second tractor units 6 and 7 is fed out from the pin feed tractor 1 at the same time as printing starts, and is conveyed to the upper and lower guide plates 3.
For example, in an offset printing machine, the printing material is guided between a blanket cylinder and an impression cylinder (not shown) for printing.

To adjust the paper position in the paper width direction during printing, for example, measure the amount of printing misalignment of the printed matter, align it with the scale of the paper position setting mechanism 34, and use the micrometer head 35.
Rotate. For example, micrometer head 35
When rotated clockwise, the spindle 36 advances and the paper width setting rod 27 is pushed toward the right main frame 20 against the biasing force of the compression spring 37, where the first and second tractor units 6, 7 are It moves integrally to the right main frame 20 side while maintaining the set paper width. When the micrometer head 35 is rotated to the left, the spindle 36 is moved backward, and the paper width setting rod 27 is pushed toward the left main frame 19 by the biasing force of the compression spring 37, where the first and second tractor units 6, 7 moves integrally to the left main frame 19 side while maintaining the set paper width.

At this time, by using the micrometer head 35 as the paper position setting mechanism 34, the amount of paper position adjustment can be grasped quantitatively. Therefore, by measuring the printing deviation of the test print, the paper position adjustment can be completed with just one operation, and the adjustment time and paper waste can be significantly reduced. Furthermore, when adjusting the paper position, if the scale of the micrometer head 35 is recorded as necessary, by adjusting the scale of the micrometer head 35 to a predetermined position, the paper position can be adjusted to a predetermined position. Adjustment can be performed efficiently and accurately with just one operation, and the reproducibility of paper position adjustment is improved.

Although the pin feed tractor of the present invention is particularly effective for form printing machines that use folded continuous paper, it is also useful for other machines such as other printing machines and printers that use continuous paper that has marginal punches on both sides. Similar effects can be expected in printing or marking in accurate positions even when applied to.

Although the paper width setting rod 27 is used as the paper width setting member in the above embodiment, it is not limited to a rod shape, and may be, for example, a plate shape. Further, although the spindle 36 of the micrometer head 35 is used to push the left end of the paper width setting rod 27, the pushing part may be any part as long as the first and second tractor units 6, 7 move together.

(Effects of the invention) As explained above, according to this invention, paper width adjustment, which adjusts the interval between the first and second tractor units to match the paper width, and paper position adjustment, which adjusts the paper position in the paper width direction, are separated. At the same time, in order to push the paper width setting member in one direction parallel to the guiding direction of the guide part, the end surface protruding from the one direction side is brought into contact with the paper width setting member side, and the forward and backward movement is performed in the one direction. The paper position is adjusted by a paper position setting mechanism that includes a micrometer head with a freely adjustable spindle and a spring body that biases the paper width setting member in the other direction parallel to the guiding direction of the guide section. Since the paper width adjustment and paper position adjustment can be performed independently, there is no need to adjust the paper width each time the paper position is adjusted.Also, the paper position can be adjusted while the paper is running, so printing misalignment can be smoothly corrected. Continuous correction is possible, the commercial value of the product is not impaired, and paper waste can be suppressed. Furthermore, since there is no need to remove the paper from the paper conveyance pin, and the paper position can be adjusted even during printing, the adjustment results can be visually confirmed immediately, and from this point of view as well, the adjustment time can be significantly shortened.

Moreover, when adjusting the paper position, in particular, the paper width setting member is pushed in one direction by the advancing operation of the spindle of the micrometer head, and the paper width setting member is pushed in one direction by the retracting operation of the spindle and the interaction with the biasing force of the spring body. Since the paper width setting member can be quantitatively adjusted by moving the paper width setting member with a simple configuration that involves pushing in the direction, the paper position can be adjusted efficiently and accurately with just one operation, and from this point of view, the adjustment time and Not only can paper waste be significantly reduced, but also the reproducibility of paper position adjustment can be ensured with good accuracy.

[Brief explanation of the drawing]

FIGS. 1 and 2 are a plan view and a front cross-sectional view, respectively, showing the mechanism of an embodiment of the pin feed tractor according to this invention. 1... Pin feed tractor, 6... First tractor unit, 7... Second tractor unit, 8
... Guide rail, 9 ... Continuous paper, 12 ... Spline shaft, 13 ... Paper conveyance pin, 14 ... Marginal punch, 27 ... Paper width setting rod, 34 ... Paper position setting mechanism, 35 ... Micrometer head, 3
6... Spindle, 37... Compression spring.

Claims (1)

[Claims for Utility Model Registration] A pin feed tractor for conveying continuous paper having marginal punches at both ends thereof, comprising: a first row of paper conveyance pins that engages with marginal punches at one end of the continuous paper; a second tractor unit having a second paper conveyance pin row that engages with a marginal punch at the other end of the continuous paper; and the first and second tractor units. a guide portion that supports and guides the paper conveyance pins while being movable in a direction perpendicular to the paper conveyance pin row; a spline shaft for synchronously driving the first and second paper conveyance pin rows; and a spline shaft disposed movably in a direction parallel to the guiding direction of the guide section, and capable of moving the first and second tractor units to arbitrary positions. a paper width setting member fixed by the paper width setting member; and a paper position setting mechanism that integrally moves and adjusts the first and second tractor units, which are fixed to the paper width setting member and have the paper width set, in a direction parallel to the guiding direction of the guide section. The paper position setting mechanism includes an end surface protruding from the one direction side that comes into contact with the paper width setting member side in order to push the paper width setting member in one direction parallel to the guiding direction of the guide section. and a micrometer head having a spindle that can be freely operated forward and backward in the one direction, and a spring body that biases the paper width setting member in the other direction parallel to the guiding direction of the guide section. Features a pin feed tractor.