JPS5957835A - Paper feeder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a paper separation roll that, at least during paper separation, transfers the uppermost paper of a stack stored in a magazine by frictional coupling, and a paper separation roll that transfers the paper coming from the magazine to a platen. The separation roll and the transport roll are driven by the platen through a gear system when the platen rotates in the paper drawing direction, and the V7 and the magazine The paper coming from was laminated in a fukazine, which was driven by the platen and held at the biting nip of the transport roll in the correct starting position for retraction by the platen, via a control element. Paper stored in piles is placed on the platen of the Inyo-style office machine.
Divide into pieces 1. The present invention relates to a paper feeding device that feeds paper by using a paper feeder.

In typewriters, automatic data printers, and other printing desks, a magazine is often used which can be mounted on the machine and stores sheets of paper to be printed in stacks.

Paper is automatically pulled out one by one from the magazine and placed on the platen. Special drive devices for separating and transporting paper separately and synchronizing it with printing operations are expensive, so it has traditionally been difficult to drive these devices by rotating the platen. Are known. The paper reaches the platen during rotation of the platen and is immediately drawn in by the platen. The paper therefore does not have precisely defined starting positions U necessary for accurate printing of the lines.

A paper feeder of the type mentioned at the beginning of this section is known from DE 1.291353. This paper feeder t is provided with a swingable stop in the paper conveyance path so that the paper reaches the platen's engagement position without being restricted. A limited starting position consisting of stones on the conveyor roll is located at the front of the thread.
Nin, you can get it. This stop is VC-swung outward from the transport path under control of the platen to draw in a piece of paper, so that the knot is released and sent towards the platen by the transport rolls. Platen σ1 drive order 1 force taken off: There is a friction clutch in the convoy, and this clutch shuts off the paper feeding device when the paper is at the stop. The paper separation roll (i) also has an overrunning clutch, which makes it possible for the pressurized paper separation roll below the paper separation roll (i) to be pulled out without being pulled out. .Also during the printing process of the platen, for example
) A clearance movement is provided in the gear train to prevent the next paper from being undesirably drawn in when re-rotating several rows apart. 3. Can swing outward from the conveying path The stop and its control, the friction clutch, the tarboring crunch, and the movement provided in the Tm series make the structure of the paper feeder expensive. Swinging the stop part outward and moving the platen [1[
1. By overcoming this, the load on the platen's driving force increases, which causes a serious problem with the platen's driving force, which is often designed to a very small value.

The problem of the present invention is that the structure is 1? A feeding device for separating and feeding sheets of paper from a macazine into paper rolls, which is designed to minimize the load on the driving force of the platen and to enable easy control by the platen. I have a lot to offer.

According to the present invention, this problem is solved in the feeding device of the type described first in this section, in which the control element is an element of the hour wheel device that drives the paper separation roll and the conveyance roll, and The element is a peripheral gear, and the peripheral gear is gear-coupled to the paper separating roll in a form-locking manner, and the control element is connected to one of the conveying rolls in a form-locking manner over the entire circumference up to the discontinuous portion. gear-coupled, the first part of the discontinuity is located in a peripheral area of the control artificial tree that is displaced with respect to the starting end of the peripheral tooth part by the paper conveyance path from the magazine to the conveyance roll, and the conveyance roll is This problem is solved by providing a device for preventing rotation of the conveying roll while the control rope is not engaged with the gear in the region of the discontinuation.

Preferred embodiments of the present invention are not shown in each embodiment section.

According to the paper feeding device of the present invention, the drive and control of the paper separation roll and the transport roll, as well as the precise positioning of the paper for precise retraction of the rows by the platen, is performed by a single control element driven by the platen. carried out by The control element is drive-locked to the phase separation roll for only a small portion of its revolution. The paper separating rolls are activated only during this rectangular period of time, pulling out the uppermost paper in each case from the stack stored in the magazine and transporting it to the nip of the transport roll. The control element does not engage the paper roll for the remainder of the rotation of the cycle, so the paper separation roll is free to rotate in either direction. The coupling eliminates the need for an overrunning clutch to pull out the paper below the existing paper separation roll.Similarly, the platen can be rotated in either direction during the printing process, and the paper separation roll is not driven by it. .This eliminates the need for gear train movement between the platen and the paper separation roll.

The transport roll has a time width that includes the time for the paper to be pulled out and fed by the paper separation roll to arrive. The control element is driven to open the entire cycle by the control element until it reaches a variation of . Therefore, the transport roll remains stationary until the paper that is firmly separated from the magazine and is pulled out is guided by the paper separating roll into the nip of the transport roll. Therefore, the paper is less susceptible to slippage K during feeding by the shredding rolls when the transport rolls are driven by the abrasive control element at precisely defined times for feeding into the platen. Despite the introduced inaccuracies in the arrival time, it is possible to assume a precise starting position at the 11-inclusive nip of the transport roll. For this reason, the conveyor rolls are accurate 1. [It also performs the function of a stop that precisely determines the starting position of the paper for retraction. There is no need for an outwardly swingable 1"-shaped section which requires additional construction cost and drive power. Since the paper is fed by the paper separation roll until it enters the nip of the conveyor roll, there is no need for a press clutch.

Preferably, the control element is designed such that the paper is transported by the paper separation roll over a distance slightly greater than the distance to the nip of the transport roll before the paper transport roll is driven again. The paper, which has been pre-stretched at the nip of the transport roll, is thereby warped somewhat in one direction, so that the leading edge of the paper is precisely positioned at the nip under a slight inherent tension. be done. In addition, the slight difference in M caused by the slippage of the red conveyor path is compensated for by the paper separation roll.

When the transport roll does not mesh with the drive/control element 1...during 1,
In order to prevent the transport rolls from rotating slightly (tU+), a stop device is provided which engages and keeps the constant speed of the rolls constant during this time. This prevents inaccurate paper positioning measurements and ensures that the VK non-drive control element meshes accurately with the transport rolls at the above times.

Due to the form-locking engagement of the drive-control elements with the coarse separation roll and the transport roll, a smooth drive is achieved and the various control processes h are accurately matched. Since the driving of the paper separation roll and the transport roll is carried out by the same drive-control element, the movement of the paper separation roll and the transport roll is forced to be precise relative to each other without the need for overprinting. [Part I] Do it.

During retraction by the platen, the paper is transported by the platen and also by the transport roll, so that the peripheral speed of the transport roll is at least equal to the peripheral speed of the platen. Furthermore, the transport roll does not prevent the platen from rotating back during the printing process, for example, for printing forms. The trailing edge of the paper drawn in by the platen leaves the transport roll by the flii control element, and the trailing edge of the paper leaves the transport roll by the flii control element, and the next paper is fed from the paper separation roll. The drive-control required η is turned on and off until reaching .

It is also b1 possible to carry out more than -2'J cycles of tying cycles during one rotational movement 11i1) of the control element. For this reason, the duration of the rotational operation is lengthened by adjusting the length of the rotation.
Two or more mesh parts of the drive phase of the paper separation roll and conveyance jJ
- Two or more discontinuous portions of the southern part for driving the wheel are arranged at angular intervals.

The driving force of the platen required by the paper feeding device of the present invention is extremely small. In particular, a coarse separation roll that rotates freely,
This does not prevent individual papers from being pulled out from the tray J'N by following the transport rolls. The paper feeder row has a structure of % u jli and is manufactured inexpensively. In particular, the control element is integrally molded from synthetic resin and has a plurality of m parts that perform various driving and control functions. The drive-control element can be of various forms. In particular, the form-locking driving effect can be provided by a toothed belt, a drive chain, for example a roller chain or a bead chain or a perforated band. The drive for the paper separation roll and the feed roll can also be carried out by 4dI gear wheels connected to each other by a reduction gearing. A single wheel configuration is structurally the simplest or otherwise the least space consuming, but sometimes only about 0.

Next, an embodiment of the present invention will be explained in detail with reference to the drawings.

FIG. 1 shows only the platen and the schematically illustrated printing head of a typewriter as a printing office machine. The LII paper feeding device that can be installed on a typewriter is a housing equipped with an O11] part J70◇→
The housing α is suspended from the quip lighter by the notch at the edge of the WQI portion.

The weight of the automatic paper feeder is supported by a support wheel ψJ, which is supported on the platen aQ by an M friction connection, preferably a form-locking gear engagement.

A magazine (A) is attached to the housing α◆ so as to stand up almost vertically. ′
It is stored in a state of being offshore. Accumulation of paper (c) σ]
The plate is supported by a swingable plate in the magazine, and the plate is held down by a compression spring.

The plate (c) is a pile of paper ψ cores under the compressed spring 10 pieces.
It can be pushed toward the separation edge and paper separation roll 0 located at the bottom of the magazine Q.

The paper separation roll has a plurality of self-mounted rolls rotating on a common axis, and the friction surfaces of these rolls engage the topmost paper (c) of the stack to .

When the paper separation roll (U → rotates clockwise (M) in Fig. 1), the topmost paper in the pile (C) moves downward and passes over the front (separation edge c1), so it is separated from the magazine 4. and then withdrawn.

There is a guide board (b) below the Magazine Q wharf, and this guide &
(b) The paper arriving from the magazine enters the pair of transport rolls (36, ?) 8). Transport roll (
66, 38) also consists of a plurality of rolls with friction surfaces seated on a common shaft and in a rotating single mass.

One of the conveyance rolls 0→ can be operated as described later, and the other conveyance roll 0→ is pressed against the conveyance roll OQ under the action of a tension spring 4, and together with the conveyance roll @. Light can rotate freely. Paper gold is conveyed by rolls (66, 38)
It is guided by these and reaches a passage formed by a guide plate 0) and another guide plate 0).

This passage reaches the retraction gap of the platen 01.

The support wheel b driven by the platen (10) transmits the rotational movement of the platen (10) to the drive control element via a gear system consisting of gears (10, 2, 3, 3).

The gear θQ also drives the discharge roll, and the discharge roll (1 is
A receiver (not shown) conveys the printed material coming from the platen α:1 to the stand.

The drive control element is a wheel (!12, and the wheel et al.
) 1, as shown in the cross-sectional view in FIG. is the axial direction (
(Hyaku part t541 provided all around the plane on the middle plane as seen)
have. Gear (9) has this tooth*l) (5i and ■
Since λ matches, wheels 6:11 are) ゛Latin 0(
Driven by a spear to sell a contract.

Continuing axially from the southern part (511), on one end surface of the wheel 63, there is a peripheral toothed part G (11), and this peripheral toothed part is a short part of the entire circumference of the wheel 6. In the embodiment shown in FIG. If the platen 01 rotates in the paper retraction direction (i.e., clockwise in FIG. Roll 0 → is driven clockwise, that is, in the paper feeding direction.
1 no longer meshes with the teeth 6 of the paper separation roll 0→,
The paper separation roll 0■ is supported so as to rotate freely.
The wheel can rotate freely over the entire remaining angular range without being affected by the wheel M! There is a toothed portion 64 on the other axial side of the circumferential surface of the wheel 6 (A).
Following this, a toothed portion (illll) is formed. The toothed portion-1 is provided over almost the entire circumference of the wheel, and has a very slight discontinuous portion (6'!I), and this discontinued portion ( i
21 spans a small angle j--range of about 20 DEG in this example.

The interrupted portion (621 is an angle corresponding to the angle between the paper separation roll and the conveyance rolls (36, 38),
The wheel (5Al-H is angularly displaced with respect to the peripheral toothed portion 6(i). The toothed portion i01 is the conveyor roll OQO
Since it meshes with the teeth (G4i) provided on the shaft, the conveyance roll 0O is driven by the platen 0I via the wheel 62.

The teeth (64) of the upsetting roll OQ no longer mesh with the teeth ←0) of the wheel 5Q9 at the discontinuous portion.

The conveyance roll OQ, which is supported so as to rotate freely, is fixed against rotation by the stop device shown enlarged in Fig. 6 when its tooth portion □□□41 does not mesh at the discontinuous portion (G21). This stop device corresponds to the stop device of the Maltese Crusade and consists of a cylindrical part [6] projecting in the axial direction on the end face of the wheel 6, the cylindrical diameter of this cylindrical part 6iFil being equal to the toothed part - ) corresponds approximately to the outer diameter of The transport roll OQ has a cylindrical portion (G
concave notch (681) with the same radius of curvature as fi)
It is equipped with a collarless ti section.

When the teeth (64) of the conveyor roll □□□ come out of engagement with the teeth at the starting end of the discontinuous portion (62) when the wheel, cylinder) rotates, the cylindrical portion (66) becomes a concave notch (
It enters the egg 1 without any play and slides 71 into this notch (11) until the end of the interrupted part 62). Therefore, the conveyor roll OQ is fixed so as not to rotate while the interrupted portion continues, and when the cylindrical portion (ti61 is again completely pushed out from the notch (i81) at the end of the force, The teeth (fill!) and the teeth (fi4!) of the conveyance roll 06 again mesh and engage accurately.

The gear device I# formed by the support wheel 9, the gear ←◆, H, 6→wheel 6 and the conveyor roll (part 6, 1 of 1+3) has a peripheral speed of Braun (1) that is faster than the conveyor roll ( It is set 81 so that the peripheral speed is equal to or smaller than the peripheral speed of t4, and the platen roller and the feed roll On have the same rotation direction.Also, the peripheral tooth portion t56
The circumference of 1 and the teeth υ of the navy blue 1 separation roll 0 are as follows: The paper separation roll 0 pulls out a sheet of paper Φ from the stack in the magazine (c) and bites it into the transport roll 0→ The paper separation roll (cl) is moved to the peripheral tooth section 66) in such a manner as to feed the paper (c) to the nip and give the paper (c) a slight outward warp.
It is designed to be rotated by.

During the rotation of the platen 01 in the retraction direction, the peripheral H tooth portion 61;
When the paper separation roll 0→ engages with the teeth of the paper separation roll 0■, the paper separation roll 0→ is driven and a set of sheets (goods) is pulled out from the magazine trunk.

The angular alignment between the peripheral teeth 6 and the discontinuous portion F37+ is such that when the front end of the paper (c) reaches the nip of the conveyor rolls (36, 38), the conveyor roll (g) (2) is defined to be locked by a locking device. The paper separation roller 0 is bent to the extent that the paper (on the paper) is bent outwards and is located at the biting nip of the transport rolls (36, 38) in a non-rotatable condition.
The differential feeding movement conditioned by the slip between the paper separation roll 02 and the paper (c), which is fed by the paper (c), is then only expressed as a degree of curling of the paper.

When the wheel rotates further, the tooth portion t51 (1) of the paper separation roll (3→) no longer meshes with the tooth portion of the paper separation roll (3), and the tooth portion of the conveyance roll oQ (['i4! is an interrupted portion ((i21
At the end of the tooth! i+ and 1- match. Transport roll (
36, 38) are driven and deliver the paper Q 1) at a precisely defined starting position digit and jE precisely defined starting point for the platen 0; Since the peripheral speed of the platen (36, 38) is not greater than the peripheral speed of the conveyor rolls (36, 38), the platen (1) is pulled in with play by the platen (1). .

At that time, the rear end of the paper (c) is drawn out below the separation roll (→, but the roll 0→ rotates freely at this time). do not have.

The paper (C) is run by the conveyor rolls (56, 38), and the platen (wheels) rotates approximately one revolution while being drawn in by the blade. The rear end of the paper 0v is the transport roll (36, 38)
When the peripheral teeth 0 and 1 enter the paper separating roll (+
2 and drives this paper separation roll so that the next paper sheet) is pulled out of the stack. After the preceding paper transport 117J completely enters between the (36, 38), the discontinuous portion 64 of the crest (6 (1) reaches the shell transport roll 0υ. Therefore, the drive of the transport roll OQ The system is shut off and the transport rolls (36, 38) are stopped by a stop device.

An axially projecting indicator portion (i+(11) is provided on the heel (5) diametrically opposite to the peripheral tooth portion G6.1.

The angular position and angular range of the indicator part (10j) are determined by the viewing window (72 is determined so that the indicated part (7fll) passes through. In this way, the peripheral tooth part (in mesh with the paper separation roll 0→ feeds the magazine containing the embarrassing pile of paper ν). Make sure that the paper device is not loaded.J capability will be provided to the operator.If such loading is done, the paper separation will be The paper feeding process carried out by roll 04 will be incomplete and failures will occur.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a paper feeding device according to the present invention, FIG. 2 is a cross-sectional view taken along line A--A in FIG. 1, and FIG. 6 is a configuration diagram of a conveyor roll stopper. 10...Platen, 22...Macadine, 24...Grade, 62...Paper separation roll, 36.38...Transportation roll, 52...Wheel (control ↓ cable), 56...j Gate sound b, 62... Interrupted part. Agent Patent Attorney Sanro Kimura

Claims (1)

[Claims] 1) R? in the magazine at least during paper separation. a paper separation roll that grips the uppermost paper of the retained pile by frictional bonding, and a pair of transport rolls for feeding the paper arriving from the magazine toward the platen, the stirring separation roll; When the conveyor roll and the filen rotate in the paper drawing direction, they can be driven by the platen through a gear system, and the paper coming from the magazine force is driven by the platen through a control element driven by the platen. The paper stored in stacked stacks in the magazine is held at the gripping two ends of the conveyor roll at the correct starting position for retraction by the platen of the printing machine grip. This is a device that separates and feeds paper sheets one by one, and the control elements include a paper separation roll 02 and a conveyance roll (36 * 38).
the control element comprises a peripheral toothing (50), the peripheral toothing being gear-coupled in a form-locking manner with the paper separation roll 6; The above-mentioned discount 1 element is gear-coupled to one conveyance roll OQ in a shape-connected manner over the entire circumference up to the discontinuous part ← force;
The above-mentioned broken part is conveyed from the magazine 12 to the transport row, +
The fli control, which is displaced with respect to the starting end of the circumferential tooth portion (5r; A sheet feeding device characterized in that a device is provided for preventing the rotation of the tF feed roll (36, 38) while the tF is not engaged with the gear in the region of the Gil. 2) A wheel 6 having a peripheral tooth portion ← “;
2, which has a circumferentially recessed toothed portion 1 (1) in a plane displaced in the axial direction, and this toothed portion 1n+ meshes with one of the conveyor rolls ((ty The sheet feeding device according to claim 1, characterized in that the discontinuous portion lI) has a plow. 6) A device for preventing the rotation of the conveyance rollers A (36, 38) , 38) as a stop device for fixing the tvF feature. 4) The above-mentioned stop device includes a cylindrical portion I61 disposed around the periphery of the wheel body) and at least one corresponding concave notch I61tl disposed around the periphery of the transport roll (c).
A paper feeding device according to claim 2 or 6, characterized in that it has the following. 5) The control element has a peripheral display part υil+, which display part serves as a visible sign during the engagement of the control element with the paper separation roll Oa.
Paper feeding device as described in section.